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Table 1 Synthesis conditions, chemical analysis and composition of the obtained precipitates

From: A study on the dissolution rates of K-Cr(VI)-jarosites: kinetic analysis and implications

Synthesis

Initial conditions/mol L−1

Elemental analysis/W  %

Approximate formula

Fe2(SO4)3∙nH2O

K2SO4

K2CrO4

Fe(NO3)3∙9H2O

K

Fe

Cr/CrO4

SO4

H+Oa

S1

0.2

0.2

6.90

31.44

19.12/42.67

18.99

[K0.95(H3O)0.05]Fe3.04(CrO4)1.99(OH)6.01

S2

0.01

0.2

0.2

4.80

27.35

14.24/31.80

4.33

31.72

[K0.61(H3O)0.39]Fe2.64[(SO4)0.24(CrO4)1.76][(OH)4.92(H2O)4.31]

S3

0.05

0.2

0.2

5.17

28.44

9.30/20.75

17.38

28.26

[K0.66(H3O)0.34]Fe2.54[(SO4)0.91(CrO4)1.09][(OH)4.62(H2O)3.13]

S4

0.025

0.05

0.2

0.2

6.70

29.88

7.72/17.23

27.71

18.50

[K0.86(H3O)0.14]Fe2.67[(SO4)1.23(CrO4)0.77][(OH)5.01(H2O)0.41]

S5

0.2

0.05

0.2

4.43

26.09

1.18/2.63

40.31

26.93

[K0.56(H3O)0.44]Fe2.33[(SO4)1.88(CrO4)0.12][(OH)3.99(H2O)3.27]

S6

0.3

0.2

0.2

4.56

25.89

0.87/1.94

40.74

26.87

[K0.59(H3O)0.41]Fe2.32[(SO4)1.91(CrO4)0.09][(OH)3.96(H2O)3.29]

S7

0.3

0.3

5.21

27.20

40.51

27.08

[K0.67(H3O)0.33]Fe2.43(SO4)2.11[(OH)4.10(H2O)3.53]

  1. aH3O+ + OH + H2O