Speciation of Chromium in Soil and Sludge in the Surrounding Tannery Region, Ranipet, Tamil Nadu

Table 1

Concentration (Ave ± Stdev, 𝑛=3 (in μg/g)) of different forms of Cr in tannery sludge samples with sequential extraction.

S. No	Water soluble	Exchangeable	Carbonate & sulfide	Reducible fraction	Oxidisable fraction	Residual fraction	Total Cr
S1	18.20 ± 0.36	194.2 ± 1.11	145.6 ± 1.20	24.27 ± 0.32	2275 ± 3.84	121.3 ± 0.92	2779 ± 4.5
S2	52.79 ± 0.48	49.27 ± 0.43	172.5 ± 1.40	21.11 ± 0.17	586.5 ± 1.61	190.0 ± 0.87	1073 ± 2.1
S3	75.12 ± 0.53	87.84 ± 0.55	179.1 ± 0.87	13.80 ± 0.07	577.9 ± 2.13	115.5 ± 1.02	1049 ± 1.9
S4	70.15 ± 0.44	15.30 ± 0.13	159.4 ± 0.82	181.1 ± 1.43	797.1 ± 2.34	31.8 ± 0.21	1255 ± 1.5
S5	57.36 ± 0.37	82.60 ± 0.47	91.78 ± 0.43	18.35 ± 0.06	186.1 ± 1.82	43.0 ± 0.37	479 ± 1.1
S6	31.09 ± 0.21	163.2 ± 1.33	121.0 ± 0.73	26.43 ± 0.12	77.73 ± 0.75	330.3 ± 3.34	757 ± 1.5
S7	150.6 ± 0.73	13.79 ± 0.23	97.84 ± 0.64	106.6 ± 0.71	47.03 ± 0.64	78.39 ± 0.46	494 ± 0.8
S8	95.37 ± 0.56	47.69 ± 0.51	59.61 ± 0.45	38.15 ± 0.38	2578 ± 4.31	268.2 ± 1.63	3087 ± 5.3
S9	68.58 ± 0.49	40.00 ± 0.32	133.7 ± 0.94	144.0 ± 0.88	77.44 ± 0.74	42.86 ± 0.44	500 ± 1.2
S10	149.5 ± 1.13	58.53 ± 0.61	145.6 ± 0.56	87.85 ± 0.82	627.5 ± 2.24	31.37 ± 0.65	1100 ± 2.5
S11	43.53 ± 0.33	180.3 ± 0.97	236.3 ± 1.62	205.2 ± 1.26	46.64 ± 0.31	155.4 ± 1.12	867 ± 1.6
S12	86.23 ± 0.62	9.58 ± 0.07	119.8 ± 1.53	9.58 ± 0.03	59.88 ± 0.27	131.7 ± 0.91	416 ± 0.9
S13	114.8 ± 0.37	31.20 ± 0.08	81.12 ± 0.72	21.22 ± 0.05	78.00 ± 0.44	62.40 ± 0.38	388 ± 0.5