Tablas de Entalpia, Gibbs Arsenico

5/26/2018 Tablas de Entalpia, Gibbs Arsenico

1/19

Appendix C

Arsenic Thermodynamic Data

C.1 Introduction

Italicized terms in the text of this appendix or words derived from the italicized terms are defined in the

glossary of Appendix B.

Table C.1 lists published thermodynamic data for arsenic, including: the more common elemental

forms, selected compounds, and some aqueous and gaseous species. The table contains Gibbs free energy

(Gf), enthalpy (Hf), entropy (S), and heat capacity (Cp) values at 1 bar pressure and mostly at

298.15 K (25 C). For thermodynamic data of chemical species not containing arsenic, extensive tables

occur in geochemistry textbooks and other references, including: (Barin, 1995; Robie, Hemingway and

Fisher, 1979; Wagman et al., 1982; Drever, 1997; Eby, 2004; Faure, 1998; Lide, 2007; Krauskopf and

Bird, 1995). Thermodynamic data are important in examining the behavior of arsenic in mineralwater

interactions, studying water quality issues, investigating the formation of ore deposits, developing andinterpreting Eh-pHdiagrams, and designing environmental remediation projects (Nordstrom and Archer,

2003, 12).

Not all published and widely accepted thermodynamic values are reliable. Nordstrom and Archer (2003)

provide a detailed review of the controversies, uncertainties, and problems related to thermodynamic data

for arsenic and its compounds and aqueous species. Many of the data are contradictory and the methods

that produce the data are sometimes questionable or have not been thoroughly documented. Too often,

data in the literature have been passed from reference to reference without critical evaluations. Some

of the data have high measurement errors, were produced under undefined or poorly defined laboratory

conditions, and involved unrepresentative sampling (Matschullat 2000, 298; Nordstrom and Archer, 2003).

Furthermore, other questionable data originate from obscure documents or are written in languages that

many individuals cannot read and properly interpret. Therefore, thermodynamic results must be acceptedwith a certain amount of caution. The table in this appendix includes thermodynamic data from various

sources, which provide users with some idea of their variability. Although sometimes unavoidable, users

Arsenic Edited by K evin R . Henke

2009 John Wiley & Sons, Ltd. ISBN: 978-0-470-02758-5


2/19

476 Arsenic

are cautioned to avoid mixing data from different literature sources when performing calculations for a

reaction. Using data from multiple sources may introduce serious errors (Wagmanet al., 1982; Eby, 2004,

474).

C.2 Modeling applications with thermodynamic data

Once high-quality laboratory data are available, they may be used in geochemical computer models, such

as MINTEQA2 (Allison, Brown and Novo-Gradac, 1991) and PHREEQC (Parkhurst and Appelo, 1999).

Langmuir (1997, 558561) provides a brief review of the different types of geochemical models and their

advantages and limitations. Geochemical models allow users to avoid tedious calculations. When properly

utilized, they may: (1) derive adsorption models, (2) identify probable aqueous species and estimate their

activities, (3) model the effects of pH, reduction/oxidation (redox conditions), temperature, ionic strength,

and other factors on arsenic chemistry, and/or (4) identify possible precipitates. However, as discussed in

Chapter 2, geochemical models are often incapable of accurately representing and predicting the complex

behavior of arsenic in natural environments. Specifically, the models typically fail to predict the presence

ofmetastable species, sluggish chemical reactions, and the effects of biological organisms.

C.3 Thermodynamic data


3/19

Arsenic Thermodynamic Data 477

TableC.1

Thermo

dynam

icdataforarsenic,

itscompounds

,an

ditsaqueousan

dgaseousspec

iesat1barpressure.

Notethatthe

unitso

fGian

d

Hiare1000times

largerthanSian

dCpi.

1kca

l=

4.1

84kJ.

C=

K

273.1

5.

(SeeAppen

dixA

forotherunitconversions).

Phasesinc

lude:

amorp

hous(am),aqueousspecies(aq),gas,

liquid(liq),and

crysta

llineso

lids(xls).

Chemicalspecies

PhaseTemperature

(K)

Gibbs

free

ene

rgy(Gi)

(kJmol1)

Enthalpy(Hi)

(kJmol1)

Entrop

y(Si)(J

mol

1K

1)

HeatCapacity

(Cpi)(J

mol1K

1)

Referen

ce

Elemental

As(0)(elementalarsenic,

rhombohedralorgray

)

xls

298.1

5

0

0

35.63

24.4

3

Nordstromand

Archer(2003)


rhombohedralorgray

)

xls

298.1

5

0

0

35.1

Wagma

netal.(1982)


rhombohedralorgray

)

xls

298.1

5

0

0

35.69

24.6

5

Robie,Hemingway

andFisher(1979)


rhombohedralorgray

)

xls

298.1

5

0

0

35.6

Naumo

v,Ryzhenko

andKhodakovsky

(1974)


rhombohedralorgray

)

xls

298.1

5

0

0

35.706

24.6

52

Barin(1

995)


rhombohedralorgray

)

xls

400

0

0

43.04

25.3

8

Robie,Hemingway

andFisher(1979)


rhombohedralorgray

)

xls

400

0

0

43.065

25.3

88

Barin(1

995)


rhombohedralorgray

)

xls

500

0

0

48.77

25.9

6

Robie,Hemingway,

andFisher(1979)


rhombohedralorgray

)

xls

500

0

0

48.790

25.9

45

Barin(1

995)


rhombohedralorgray

)

xls

600

0

0

53.55

26.5

1

Robie,Hemingway

andFisher(1979)


rhombohedralorgray

)

xls

600

0

0

53.569

26.5

01

Barin(1

995)


rhombohedralorgray

)

xls

700

0

0

57.68

27.0

5

Robie,Hemingway

andFisher(1979)


rhombohedralorgray

)

xls

700

0

0

57.696

27.0

54

Barin(1

995)

(continue

doverlea

f)


4/19

478 Arsenic

TableC.1

(continue

d)

Chemicalspecies

PhaseTemperature

(K)

Gibbs

free

ene

rgy(Gi)

(kJmol1)

Enthalpy(Hi)

(kJmol1)

Entrop

y(Si)(J

mol

1K

1)

HeatCapacity

(Cpi)(J

mol1K

1)

Referen

ce


rhombohedralorgray

)

xls

800

0

0

61.33

27.6

0

Robie,Hemingway

andFisher(1979)


rhombohedralorgray

)

xls

800

0

0

61.344

27.5

80

Barin(1

995)


rhombohedralorgray

)

xls

875

0

0

63.82

28.0

3

Robie,Hemingway

andFisher(1979)


amorphousorblack)

am

298.1

5

4.2

Wagmanetal.(1982)


amorphousorblack)

am

298.1

5

13.6

Naumo

v,Ryzhenko

andKhodakovsky

(1974)

As+

gas

298.1

5

1255.6

Wagmanetal.(1982)

As2+

gas

298.1

5

3059.8

Wagmanetal.(1982)

As3+

gas

298.1

5

5801.1

Wagmanetal.(1982)

As4+

gas

298.1

5

10644

Wagmanetal.(1982)

As5+

gas

298.1

5

16694

Wagmanetal.(1982)

As6+

gas

298.1

5

29045

Wagmanetal.(1982)

As2

gas

298.1

5

171.9

222.2

239.4

35.0

03

Wagma

netal.(1982)

As2

gas

298.1

5

143

194

242.2

Naumo

v,Ryzhenko

andKhodakovsky

(1974)

As4

gas

298.1

5

92.4

143.9

314

Wagma

netal.(1982)

As4

gas

298.1

5

87.9

144

330

Naumo

v,Ryzhenko

andKhodakovsky

(1974)

As4

gas

298.1

5

98.26

1

153.3

0

327.43

77.2

08

Barin(1

995)

Gasesandaqueousspecies

ofarseniccompounds


5/19


Ag3AsO

4

xls

298.1

5

545.3

9

634.2

9

275.83

173.8

6

Barin(1

995)

AlAs

xls

298.1

5

116.3

Wagma

netal.(1982)

AlAs

xls

298.1

5

115.2

0

116.3

2

60.2

5

45.8

0

Barin(1

995)

AlAsO

4

xls

298.1

5

1333.1

1431.1

145.60

118.3

4

Barin(1

995)

AlAsO

4

xls

298.1

5

1280.8

Ryuetal.(2002)

AlAsO

42H

2O

(mansfieldite)

xls

298.1

5

1709

Naumo

v,Ryzhenko

andKhodakovsky

(1974)

AsBr3

gas298.1

5

161.6

7

132.1

363.8

Pankratovand

Uchaeva(2000)

AsBr3

gas298.1

5

159

130

363.87

79.1

6

Wagma

netal.(1982)

AsBr3

gas298.1

5

159.8

0

130.0

0

363.99

78.9

92

Barin(1

995)

AsCl3

gas298.1

5

258.0

5

270.3

328.8

Pankratovand

Uchaeva(2000)

AsCl3

gas298.1

5

248.9

261.5

327.17

75.7

3

Wagma

netal.(1982)

AsCl3

gas298.1

5

248.6

6

261.5

0

327.30

75.3

95

Barin(1

995)

AsCl3

liq

298.1

5

259.4

305.0

216.3

Wagmanetal.(1982)

AsCl3

liq

298.1

5

259.0

8

305.0

1

216.31

133.4

7

Barin(1

995)

AsF

3

gas298.1

5

905.6

7

785.8

289.0

Pankratovand

Uchaeva(2000)

AsF

3

gas298.1

5

770.7

6

785.7

6

298.10

65.6

1

Wagma

netal.(1982)

AsF

3

gas298.1

5

770.6

5

785.7

6

289.22

64.6

84

Barin(1

995)

AsF

3

liq

298.1

5

774.1

6

821.3

181.21

126.5

7

Wagma

netal.(1982)

AsF

3

liq

298.1

5

774.0

1

821.3

2

181.21

126.5

5

Barin(1

995)

AsF

5

gas298.1

5

1172.5

1236.7

Pankratovand

Uchaeva(2000)

(continue

doverlea

f)


6/19

480 Arsenic

TableC.1

(continue

d)

Chemicalspecies

PhaseTemperature

(K)

Gibbs

free

ene

rgy(Gi)

(kJmol1)

Enthalpy(Hi)

(kJmol1)

Entrop

y(Si)(J

mol

1K

1)

HeatCapacity

(Cpi)(J

mol1K

1)

Referen

ce

AsF

5

gas

298.1

5

116

9.0

1234.2

87.8

4

OHare

(1993)

AsF

5

gas

298.1

5

116

9.6

1236.8

317.26

97.5

41

Barin(1

995)

AsH

3

(arsine)

gas

298.1

5

68.91

66.4

0

223.0

Pankratovand

Uchaeva(2000)

AsH

3

(arsine)

gas

298.1

5

68.93

66.4

4

222.78

38.0

7

Wagma

netal.(1982)

AsH

3

(arsine)

gas

298.1

5

68.83

66.4

223

Naumo

v,Ryzhenko

andKhodakovsky

(1974)

AsH

3

(arsine)

gas

298.1

5

69.10

9

66.4

42

222.78

38.0

72

Barin(1

995)

AsI

3

xls

298.1

5

59.4

58.2

213.05

105.7

7

Wagma

netal.(1982)

AsI

3

xls

298.1

5

59.0

91

58.1

58

213.05

105.7

7

Barin(1

995)

AsI

3

gas

298.1

5

388.34

80.6

3

Wagma

netal.(1982)

AsI

3

gas

298.1

5

15.3

21

38.9

11

391.82

80.9

60

Barin(1

995)

AsN

gas

298.1

5

167.9

7

196.2

7

225.6

30.4

2

Wagma

netal.(1982)

AsO

gas

298.1

5

84.7

15

57.2

87

230.27

32.3

42

Barin(1

995)

As2O

3

(arsenolite,cubic)

xls

298.1

5

576.3

4

657.2

7

107.38

96.8

8

Nordstromand

Archer(2003)

As2O

3

(arsenolite,cubic)

xls

298.1

5

576

657

107.4

Robie,Hemingway

andFisher(1979)

As2O

3

(arsenolite,cubic)

xls

298.1

5

588

.3

666.1

117

Naumo

v,Ryzhenko

andKhodakovsky

(1974)

As2O

3

(arsenolite,cubic)

xls

298.1

5

576

.41

Davisetal.(1996)

As2O

3

(arsenolite,cubic)

xls

298.1

5

575.9

6

656.9

7

107.41

96.8

78

Barin(1

995)

As2O

3

(claudetite,

monoclinic)

xls

298.1

5

576.5

3

655.6

7

113.37

96.9

8

Nordstromand

Archer(2003)

As2O

3

(claudetite,

monoclinic)

xls

298.1

5

576

655

113.3

Robie,Hemingway

andFisher(1979)

As2O

3

(claudetite,

monoclinic)

xls

298.1

5

589

.1

664.0

127

Naumo

v,Ryzhenko

andKhodakovsky

(1974)


7/19


As2O

3

(claudetite,

monoclinic)

xls

298.1

5

576.6

4

654.8

0

117.00

96.9

79

Barin(1

995)

As2O

3SO

3

xls

298.1

5

1194.3

2

Wagmanetal.(1982)

As2O

5

xls

298.1

5

774.9

6

917.5

9

105.44

115.9

Nordstromand

Archer(2003)

As2O

5

xls

298.1

5

782.0

924.7

105

Naumo

v,Ryzhenko

andKhodakovsky

(1974)

As2O

5

xls

298.1

5

782.7

8

Davisetal.(1996)

As2O

5

xls

298.1

5

782.3

924.8

7

105.4

116.5

2

Wagma

netal.(1982)

As2O

5

xls

298.1

5

782.0

9

924.8

7

105.40

116.5

4

Barin(1

995)

As2O

5

xls

400

733.3

1

924.5

9

142.62

136.5

4

Barin(1

995)

As2O

5

xls

500

685.6

6

922.9

3

174.77

151.7

8

Barin(1

995)

As2O

54H

2O

xls

298.1

5

2104.6

Wagmanetal.(1982)

As2O

54H

2O

xls

298.1

5

1720

Faure(1998)

(As2O

5)35H

2O

xls

298.1

5

4248.4

Wagma

netal.(1982)

As4O

6

gas298.1

5

1092.2

1196.2

409.35

173.6

0

Barin(1

995)

AsS(,realgar)

xls

298.1

5

31.3

31.8

62.9

47

Nordstromand

Archer(2003)

AsS(,realgar)

xls

298.1

5

35

36

63.5

Naumo

v,Ryzhenko

andKhodakovsky

(1974)

AsS()

xls

298.1

5

30.9

31.0

63.5

47

Nordstromand

Archer(2003)

AsS(OH)(SH)

aq

298.1

5

245.1

1

Helzet

al.(1995)

As2S3

am

298.1

5

76.8

66.9

200

Nordstromand

Archer(2003)

As2S3(orpiment)

xls

298.1

5

84.9

85.8

163.8

163

Nordstromand

Archer(2003)

As2S3(orpiment)

xls

298.1

5

95.4

96.2

164

Naumo

v,Ryzhenko

andKhodakovsky

(1974)

As3S4(SH)2

aq

298.1

5

127.1

9

Helzet

al.(1995)

(continue

doverlea

f)


8/19

482 Arsenic

TableC.1

(continue

d)

Chemicalspecies

PhaseTemperature

(K)

Gibbs

free

ene

rgy(Gi)

(kJmol1)

Enthalpy(Hi)

(kJmol1)

Entrop

y(Si)(J

mol

1K

1)

HeatCapacity

(Cpi)(J

mol1K

1)

Referen

ce

As2Se

3

xls

298.1

5

88.4

86.1

7.8

OHare

etal.(1990)

As2Se

3

xls

298.1

5

81.1

OHare

(1993)

As2Se

3

xls

298.1

5

101

.43

102.5

1

194.56

121.3

9

Barin(1

995)

As2Se

3

am

298.1

5

53.1

OHare

(1993)

As2Te3

xls

298.1

5

39.5

80

37.6

56

226.35

127.4

9

Barin(1

995)

Ba3(AsO

4)2

xls

298.1

5

3113.4

0

Zhuetal.(2005)

Ba3(AsO

4)2

xls

298.1

5

319

2.2

3421.7

309.62

257.2

1

Barin(1

995)

BaHAsO

4H2O

xls

298.1

5

1544.4

7

Zhuetal.(2005)

Be3(AsO

4)2

xls

298.1

5

252

5.5

2738.1

207.28

232.5

2

Barin(1

995)

BiAsO

4

xls

298.1

5

619

Wagma

netal.(1982)

BiAsO

4

xls

298.1

5

695

.43

795.2

1

168.07

121.1

2

Barin(1

995)

BiAsO

4

(rooseveltite)

xls

298.1

5

613

.58

Naumo

v,Ryzhenko

andKhodakovsky

(1974)

(CH

3)3As

gas

298.1

5

12

Pankratovand

Uchaeva(2000)

Ca(H

2AsO

4)2

xls

298.1

5

205

4

Ryuetal.(2002)

Ca2AsO

4OH

xls

298.1

5

198

8

Ryuetal.(2002)

Ca3(AsO

4)2

xls

298.1

5

306

1

Ryuetal.(2002)

Ca3(AsO

4)2

xls

298.1

5

306

3.1

3298.7

226.00

249.7

9

Barin(1

995)

Ca3(AsO

4)2

xls

298.1

5

306

3.0

3298.7

226

Wagma

netal.(1982)

Ca3(AsO

4)22.2

5H

2O

xls

298.1

5

3611.5

0

Zhuetal.(2006)

Ca3(AsO

4)23H

2O

xls

298.1

5

3787.8

7

Zhuetal.(2006)

Ca3(AsO

4)23.6

7H

2O

xls

296

3945

Bothea

ndBrown

(1999)

Ca3(AsO

4)24H

2O

xls

298.1

5

401

9

Naumo

v,Ryzhenko

andKhodakovsky

(1974)

Ca3(AsO

4)24.2

5H

2O

xls

296

4085

Bothea

ndBrown

(1999)


9/19


Ca3(AsO

4)26H

2O

xls298.1

5

2732

Naumo

v,Ryzhenko

andKhodakovsky

(1974)

Ca3(AsO

4)28H

2O

xls298.1

5

3530

Naumo

v,Ryzhenko

andKhodakovsky

(1974)

Ca4(OH)2(AsO

4)24H

2O

xls296

4941

Bothea

ndBrown

(1999)

Ca4(OH)2(AsO

4)24H

2O

xls298.1

5

4928.8

6

Zhuetal.(2006)

Ca5(AsO

4)3OH

xls296

5087

Bothea

ndBrown

(1999)

Ca5(AsO

4)3OH

xls298.1

5

5096.4

7

Zhuetal.(2006)

Ca5H

2(AsO

4)4

xls298.1

5

5636.7

Ryuetal.(2002)

Ca5H

2(AsO

4)49H

2O

(ferrarisite)

xls296

7808

Bothea

ndBrown

(1999)

Ca5H

2(AsO

4)49H

2O

(guerinite)

xls296

7803

Bothea

ndBrown

(1999)

CaH(AsO

4)H

2O

xls296

1533

Bothea

ndBrown

(1999)

CaHAsO

0 4

aq

298.1

5

1446.0

Wagma

netal.(1982)

Cd

3(AsO

4)2

xls298.1

5

1716.1

Wagmanetal.(1982)

Cd

3(AsO

4)2

xls298.1

5

1712.0

1934.3

301.71

258.8

2

Barin(1

995)

Cd

3As2

xls298.1

5

41.8

Wagma

netal.(1982)

Cd

3As2

xls298.1

5

35.88

5

41.8

40

206.83

125.3

0

Barin(1

995)

CdAs2

xls298.1

5

17.6

Wagma

netal.(1982)

CoAs

xls298.1

5

40.6

Wagma

netal.(1982)

CoAs(modderite)

xls298.1

5

49

51

59

Naumo

v,Ryzhenko

andKhodakovsky

(1974)

CoAs2

xls298.1

5

61.5

Wagma

netal.(1982)

CoAs2(safflorite)

xls298.1

5

97

83

100

Naumo

v,Ryzhenko

andKhodakovsky

(1974)

(continue

doverlea

f)


10/19

484 Arsenic

TableC.1

(continue

d)

Chemicalspecies

PhaseTemperature

(K)

Gibbs

free

ene

rgy(Gi)

(kJmol1)

Enthalpy(Hi)

(kJmol1)

Entrop

y(Si)(J

mol

1K

1)

HeatCapacity

(Cpi)(J

mol1K

1)

Referenc

e

Co

2As

xls

298.1

5

39.7

Wagman

etal.(1982)

Co

2As3

xls

298.1

5

97.5

Wagman

etal.(1982)

Co

3As2

xls

298.1

5

81.2

Wagman

etal.(1982)

Co

5As2

xls

298.1

5

79.5

Wagman

etal.(1982)

Co

3(AsO

4)2

xls

298.1

5

162

0.8

Wagman

etal.(1982)

Co

3(AsO

4)2

xls

298.1

5

167

1.9

1864.3

337.02

264.3

1

Barin(19

95)

CrAsO

4

xls

298.1

5

968

.36

1062.1

155.35

119.1

0

Barin(19

95)

Cr3(AsO

4)2

xls

298.1

5

202

7.0

2218.2

321.42

261.8

3

Barin(19

95)

Cs3AsO

4

xls

298.1

5

154

3.9

1668.5

283.59

176.2

2

Barin(19

95)

Cu

3As

xls

298.1

5

11.7

Wagman

etal.(1982)

Cu

3As

xls

298.1

5

12.3

22

11.7

15

137.24

93.0

80

Barin(19

95)

Cu

3(AsO

4)

xls

298.1

5

624

.04

710.3

6

255.98

176.3

6

Barin(19

95)

xls

298.1

5

130

0.7

Wagman

etal.(1982)

Cu

3(AsO

4)2

xls

298.1

5

130

1.3

2

Davisetal.(1996)

Cu

3(AsO

4)2

xls

298.1

5

131

6.0

1522.6

298.61

258.2

1

Barin(19

95)

Cu

3(AsO

4)26H

2O

xls

298.1

5

273

3.0

4

Davisetal.(1996)

Cu

3AsS

4

(enargite)

xls

298.1

5

206.7

4

179.0

356.4

CastroandBaltierra

(2005)andKantar

(2002)

Cu

3AsS

4

(enargite)

xls

298.1

5

257.6

190.4

Sealetal.(1996)

Cu

3AsS

4

(enargite)

xls

298.1

5

437

.26

Davisetal.(1996)

Fe3(AsO

4)2

xls

298.1

5

175

3.9

3

Davisetal.(1996)

Fe3(AsO

4)28H

2O

(symplesite)

xls

298.1

5

368

7.2

6

Davisetal.(1996)

FeAs(westerveldite)

xls

298.1

5

43.3

6

43.5

1

62.5

50.3

6

Perfettietal.(2008)

FeAs2(loellingite)

xls

298.1

5

52.0

9

43.5

127

Naumov,

Ryzhenko

andKhodakovsky

(1974)


11/19


FeAsO

4

xls298.1

5

772.3

9

865.3

4

161.54

117.0

5

Barin(1

995)

FeAsO

4

xls298.1

5

772.6

2

Ryuetal.(2002)

FeAsO

42H

2O(scorodite

)

xls298.1

5

1280.1

Ryuetal.(2002)

FeAsO

42H

2O(scorodite

)

xls296

1279.2

Krause

andEttel

(1988)

FeAsO

42H

2O(scorodite

)

xls298.1

5

1267.6

9

Davisetal.(1996)

Fe3(AsO

4)2

xls298.1

5

1766.0

1955.0

339.91

264.6

4

Barin(1

995)

FeAsS(arsenopyrite)

xls298

136.4

5

144.3

6

68.5

68.4

4

Perfetti

etal.(2008)

FeAsS(arsenopyrite)

xls298

141.6

Pokrovski,Karaand

Roux

(2002)

FeAsS(arsenopyrite)

xls298.1

5

127.2

5

Davisetal.(1996)

FeAsS

2

(loellingite)

xls298.1

5

80.23

85.7

7

80.1

70.8

3

Perfetti

etal.(2008)

FeAsS

2

(loellingite)

xls298.1

5

52.11

6

Davisetal.(1996)

GaAs(galliumarsenide)

xls298.1

5

67.8

71

64.1

8

46.2

3

Wagma

netal.(1982)


xls298.1

5

70.37

4

74.0

57

64.1

83

46.8

58

Barin(1

995)


xls298.1

5

67.8

71

64.2

Naumo

v,Ryzhenko

andKhodakovsky

(1974)

GaAsO

4

xls298.1

5

901.8

5

1002.2

150.12

118.2

6

Barin(1

995)

H3AsO

0 3

aq

298.1

5

639.8

737.3

212.4

85.0

Perfetti

etal.(2008)

H3AsO

0 3

aq

298.1

5

640.0

3

742.3

6

195.8

Nordstromand

Archer(2003)

H3AsO

0 3

aq

298.1

5

639.7

8

740.8

2

200

197

Pokrovskietal.

(1996)

H2AsO3

aq

298.1

5

587.1

3

714.7

9

110.5

Wagmanetal.(1982)

H2AsO3

aq

298.1

5

587.6

6

714.7

4

112.79

Nordstromand

Archer(2003)

HAsO

2

3

aq

298.1

5

524

689

15

Dovea

ndRimstidt

(1985)

(continue

doverlea

f)


12/19

486 Arsenic

TableC.1

(continue

d)

Chemicalspecies

PhaseTemperature

(K)

Gibbs

free

ene

rgy(Gi)

(kJmol1)

Enthalpy(Hi)

(kJmol1)

Entrop

y(Si)(J

mol

1K

1)

HeatCapacity

(Cpi)(J

mol1K

1)

Referen

ce

HAsO

2

3

aq

298.1

5

524

.3

Naumo

v,Ryzhenko

andKhodakovsky

(1974)

AsO

3

3

aq

298.1

5

448

664

187

Dovea

ndRimstidt

(1985)

AsO

3

3

aq

298.1

5

447

.7

Naumo

v,Ryzhenko

andKhodakovsky

(1974)

H3AsO

0 4

aq

298.1

5

766

.3

898.6

198.3

105.0

Perfetti

etal.(2008)

H3AsO

0 4

aq

298.1

5

766

.75

903.4

5

183.07

Nordstromand

Archer(2003)

H2AsO4

aq

298.1

5

753

.17

909.5

6

117

Wagma

netal.(1982)

H2AsO4

aq

298.1

5

753

.65

911.4

2

112.38

Nordstromand

Archer(2003)

HAsO

2

4

aq

298.1

5

713

.73

908.4

1

11.42

Nordstromand

Archer(2003)

HAsO

2

4

aq

298.1

5

714

.60

906.3

4

Wagma

netal.(1982)

AsO

3

4

aq

298.1

5

646

.36

890.2

1

176.31

Nordstromand

Archer(2003)

HAsO

3F

aq

298.1

5

106

0.9

6

Wagma

netal.(1982)

AsO

3F2

aq

298.1

5

102

7.4

5

Wagma

netal.(1982)

Hg3(AsO

4)2

xls

298.1

5

103

3.6

1271.0

323.47

261.7

2

Barin(1

995)

InAs(indiumarsenide)

xls

298.1

5

53.6

58.6

75.7

47.7

8

Wagma

netal.(1982)


xls

298.1

5

53.2

86

58.6

01

75.701

47.7

80

Barin(1

995)


xls

298.1

5

52.7

57.7

75.7

Naumo

v,Ryzhenko

andKhodakovsky

(1974)

InAsO

4

xls

298.1

5

874

.26

978.3

0

154.85

119.3

2

Barin(1

995)

KAs

xls

298.1

5

102.9

Wagma

netal.(1982)


13/19


KAs2

xls298.1

5

127.2

Wagma

netal.(1982)

K3As

xls298.1

5

186.2

Wagma

netal.(1982)

K5As4

xls298.1

5

452.7

Wagma

netal.(1982)

KH

2AsO

4

xls298.1

5

1035.9

1180.7

155.02

126.7

3

Wagma

netal.(1982)

KH

2AsO

4

xls298.1

5

1041.6

1186.2

155

Naumo

v,Ryzhenko

andKhodakovsky

(1974)

K3(AsO

4)

xls298.1

5

1548.8

1668.7

237.82

172.2

9

Barin(1

995)

KUO

2AsO

4

xls298.1

5

2021.1

Naumo

v,Ryzhenko

andKhodakovsky

(1974)

LaAsO

4

xls298.1

5

1455.7

1556.9

163.47

117.8

9

Barin(1

995)

Li3(AsO

4)

xls298.1

5

1595.0

1702.4

173.13

161.8

4

Barin(1

995)

MgAs4

xls298.1

5

126

Wagmanetal.(1982)

Mg3As2

xls298.1

5

371.5

Wagma

netal.(1982)

Mg3(AsO

4)2

xls298.1

5

3092.8

Wagma

netal.(1982)

Mg3(AsO

4)2

xls298.1

5

2775

Ryuetal.(2002)

(continue

doverlea

f)


14/19

488 Arsenic

TableC.1

(continue

d)

Chemicalspecies

PhaseTemperature

(K)

Gibbs

free

ene

rgy(Gi)

(kJmol1)

Enthalpy(Hi)

(kJmol1)

Entrop

y(Si)(J

mol

1K

1)

HeatCapacity

(Cpi)(J

mol1K

1)

Referen

ce

Mg3(AsO

4)2

xls

298.1

5

283

1.7

3059.8

225.10

236.3

1

Barin(1

995)

Mg3(AsO

4)210H

2O

xls

298.1

5

514

7.2

Ryuetal.(2002)

MgHAsO

4

xls

298.1

5

118

7

Ryuetal.(2002)

MgHAsO

47H

2O

(roesslerite)

xls

298.1

5

284

8

Ryuetal.(2002)

MgNH

4AsO

46H

2O

xls

298.1

5

3316.7

Wagmanetal.(1982)

MnAs()

xls

298.1

5

61.6

36

51.8

61

107.00

71.1

16

Barin(1

995)

MnAs()

xls

298.1

5

59.8

65

53.2

97

91.442

70.3

40

Barin(1

995)

MnAs()

xls

298.1

5

59.6

91

56.9

02

77.069

70.1

64

Barin(1

995)

MnAs

xls

298.1

5

59

Wagma

netal.(1982)

MnAs(kaneite)

xls

298.1

5

55.2

57.3

60

Naumo

v,Ryzhenko

andKhodakovsky

(1974)

Mn

3(AsO

4)2

xls

298.1

5

216

7.4

Ryuetal.(2002)

Mn

3(AsO

4)2

xls

298.1

5

2145.6

Wagma

netal.(1982)

Mn

3(AsO

4)2

xls

298.1

5

216

7.0

2366.3

319.62

261.7

9

Barin(1

995)

Mn

3(AsO

4)28H

2O

xls

298.1

5

405

5

Naumo

v,Ryzhenko

andKhodakovsky

(1974)

MnHAsO

4

xls

298.1

5

1102.5

Wagma

netal.(1982)

MoAsO

4

xls

298.1

5

817

.79

910.6

9

163.01

120.0

6

Barin(1

995)

NaAs

xls

298.1

5

89.1

96.2

62.8

Wagma

netal.(1982)

NaAs2

xls

298.1

5

100

.4

106.7

100

Wagma

netal.(1982)

Na3As

xls

298.1

5

187

.4

205

130

Wagma

netal.(1982)

Na3As

xls

298.1

5

187

.10

205.0

2

130.00

97.7

69

Barin(1

995)


15/19


NaAsO

2

xls298.1

5

660.5

3

Wagma

netal.(1982)

NaUO

2AsO

44H

2O

xls298.1

5

2944.6

Naumo

v,Ryzhenko

andKhodakovsky

(1974)

Na3AsO

4

xls298.1

5

1540

Wagmanetal.(1982)

Na3AsO

4

xls298.1

5

1426.0

1540.0

217.94

170.1

3

Barin(1

995)

Na3AsO

412H

2O

xls298.1

5

5092

Wagmanetal.(1982)

NiAs(nickeline,niccolite)

xls298.1

5

61

Naumo

v,Ryzhenko

andKhodakovsky

(1974)

NiAs

xls298.1

5

67.26

8

73.2

91

45.3

80

56.0

01

Barin(1

995)

Ni3(AsO

4)2

xls298.1

5

1579.3

Wagmanetal.(1982)

Ni3(AsO

4)2

xls298.1

5

1659.4

1849.2

344.80

265.4

1

Barin(1

995)

Ni3(AsO

4)28H

2O

(Annabergite)

xls298.1

5

3482

Naumo

v,Ryzhenko

andKhodakovsky

(1974)

Ni5As2

xls298.1

5

242.1

1

251.1

0

190.63

215.9

8

Barin(1

995)

Ni1

1As8

xls298.1

5

762.6

3

774.0

4

468.88

552.0

0

Barin(1

995)

NH

4H

2AsO

4

xls298.1

5

832.9

1059.8

172.05

151.1

7

Wagma

netal.(1982)

(continue

doverlea

f)


16/19

490 Arsenic

TableC.1

(continue

d)

Chemicalspecies

PhaseTemperature

(K)

Gibbs

free

ene

rgy(Gi)

(kJmol1)

Enthalpy(Hi)

(kJmol1)

Entrop

y(Si)(J

mol

1K

1)

HeatCapacity

(Cpi)(J

mol1K

1)

Referen

ce

NH

4H

2AsO

4

xls

298.1

5

837

.34

1064.1

172

Naumo

v,Ryzhenko

andKhodakovsky

(1974)

(NH

4)2HAsO

4

xls

298.1

5

1181.6

Wagma

netal.(1982)

(NH

4)3AsO

4

xls

298.1

5

1286.2

Wagma

netal.(1982)

(NH

4)3AsO

43H

2O

xls

298.1

5

2166.9

Wagmanetal.(1982)

Pb

3(AsO

4)2

xls

298.1

5

155

3.1

1780.2

324.60

258.0

0

Barin(1

995)

Pb

3(AsO

4)2

xls

298.1

5

158

0.0

1

Davisetal.(1996)

Pb

3(AsO

4)2

xls

298.1

5

157

9.3

Naumo

v,Ryzhenko

andKhodakovsky

(1974)

Pb

5(AsO

4)3Cl(mimetite)

xls

298.1

5

261

6.2

5

Davisetal.(1996)

Pb

5(AsO

4)3OH

xls

298.1

5

265

9

LeeandNriagu

(2007)

PbHAsO

4

xls

298.1

5

805

.66

LeeandNriagu

(2007)

Rb

3(AsO

4)

xls

298.1

5

154

7.0

1669.0

267.06

175.2

8

Barin(1

995)

Re3As7

xls

298.1

5

88.6

24

95.3

95

336.81

248.6

4

Barin(1

995)

ReAsO

4

xls

298.1

5

678

.39

771.5

7

170.00

121.3

7

Barin(1

995)

Sn3(AsO

4)2

xls

298.1

5

156

4.6

1785.8

303.93

259.1

Barin(1995)

Sr3(AsO

4)2

xls

298.1

5

309

4.4

3317.1

312.1

257.6

Barin(1

995)

Ti3(AsO

4)2

xls

298.1

5

254

7.3

2617.3

339.4

264.5

Barin(1

995)


17/19


TlAsO

4

xls298.1

5

885.8

1

948.5

6

299.74

145.6

9

Barin(1

995)

YAsO

4

xls298.1

5

1416.8

1515.1

160.54

120.7

5

Barin(1

995)

Zn

3(AsO

4)2

xls298.1

5

1895.9

1

Davisetal.(1996)

Zn

3(AsO

4)2

xls298.1

5

1895

Wagmanetal.(1982)

Zn

3(AsO

4)2

xls298.1

5

1915.6

2134.7

281.92

255.2

8

Barin(1

995)

Zn

3(AsO

4)22.5

H2O

(legrandite)

xls298.1

5

2611

Naumo

v,Ryzhenko

andKhodakovsky

(1974)

ZnAs2

xls298.1

5

41.8

Wagma

netal.(1982)

Zn

3As2

xls298.1

5

125.4

6

133.8

9

168.04

125.2

3

Barin(1

995)

Zn

3As2

xls298.1

5

32.2

Wagma

netal.(1982)


18/19

492 Arsenic

References

Allison, J.D., Brown, D.S. and Novo-Gradac, K.J. (1991)MINTEQA2/PRODEFA2: A Geochemical Assessment Model

for Environmental Systems: Version 3.0 Users Manual , U.S. Environmental Protection Agency, Washington, DC.

Barin, I. (1995)Thermochemical Data of Pure Substances: Parts 1 and II, 3rd edn. Weinheim, VCH Verlagsgesellschaft,

1885 pp.Bothe, J.V. Jr. and Brown, P.W. (1999) The stabilities of calcium arsenates at 23 1 C. Journal of Hazardous

Materials, 69(2), 197207.

Castro, S.H. and Baltierra, L. (2005) Study of the surface properties of enargite as a function of pH. International

Journal of Mineral Processing, 77(2), 10415.

Davis, A., Ruby, M.V., Bloom, M. et al. (1996) Mineralogic constraints on the bioavailability of arsenic in

smelter-impacted soils. Environmental Science and Technology , 30(2), 39299.

Dove, P.M. and Rimstidt, J.D. (1985) The solubility and stability of scorodite, FeAsO4.2H2O.American Mineralogist,

70(78), 838 44.

Drever, J.I. (1997)The Geochemistry of Natural Waters: Surface and Groundwater Environments , Upper Saddle River,

NJ, Prentice Hall, 436 pp.

Eby, G.N. (2004) Principles of Environmental Geochemistry , Brooks/Cole-Thomson Learning, Pacific Grove, CA,

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Helz, G.R., Tossell, J.A., Charnock, J.M. et al. (1995) Oligomerization in As(III) sulfide solutions: theoretical con-

straints and spectroscopic evidence. Geochimica et Cosmochimica Acta , 59(22), 4591604.

Kantar, C. (2002) Solution and flotation chemistry of enargite. Colloids and Surfaces A: Physicochemical and Engi-

neering Aspects, 210(1), 2331.

Krause, E. and Ettel, V.A. (1988) Solubility and stability of scorodite, FeAsO4.2H2O: new data and further discussion.

American Mineralogist, 73(78), 850 54.

Krauskopf, K.B. and Bird, D.K. (1995) Introduction to Geochemistry , 3rd edn. McGraw-Hill, Boston.

Langmuir, D. (1997) Aqueous Environmental Geochemistry , Upper Saddle River, NJ, Prentice Hall, 600 pp.

Lee, J.S. and Nriagu, J.O. (2007) Stability constants for metal arsenates. Environmental Chemistry , 4(2), 12333.

Lide, D.R. (ed) (2007) CRC Handbook of Chemistry and Physics , 88th edn. CRC Press, Boca Raton, FL.

Matschullat, J. (2000) Arsenic in the geosphere A review. Science of the Total Environment, 249(13), 297312.

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