Table 2.

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

S. No	Water soluble	Exchangeable	Carbonate & sulfide	Reducible fraction	Oxidisable fraction	Residual fraction	Total Cr
1a	51.85 ± 0.34	29.62 ± 0.20	17.28 ± 0.30	98.76 ± 0.92	55.55 ± 0.32	64.81 ± 0.67	317.9 ± 2.1
1b	83.29 ± 0.61	36.74 ± 0.60	14.69 ± 0.40	102.8 ± 1.20	52.05 ± 0.43	42.87 ± 0.41	332.5 ± 2.8
1c	44.48 ± 0.21	23.47 ± 0.05	13.59 ± 0.06	98.86 ± 0.58	49.43 ± 0.17	24.70 ± 0.04	254.6 ± 1.9
2a	80.29 ± 0.42	29.29 ± 0.15	13.38 ± 0.22	105.8 ± 0.73	42.57 ± 0.21	36.49 ± 0.35	307.8 ± 2.7
2b	49.11 ± 0.33	36.83 ± 0.30	19.64 ± 0.33	115.4 ± 0.72	30.69 ± 0.41	39.90 ± 0.06	291.6 ± 0.9
2c	81.04 ± 0.61	12.27 ± 0.60	18.41 ± 0.16	103.1 ± 0.80	36.83 ± 0.33	61.39 ± 0.61	313.1 ± 2.1
3a	57.09 ± 0.23	35.98 ± 0.45	17.36 ± 0.23	107.9 ± 0.90	34.11 ± 0.31	68.23 ± 0.63	327.7 ± 1.7
3b	34.58 ± 0.21	44.33 ± 0.21	16.00 ± 0.31	108.3 ± 0.32	36.94 ± 0.42	36.94 ± 0.32	277.1 ± 1.1
3c	22.55 ± 0.09	45.11 ± 0.38	42.60 ± 0.62	112.7 ± 0.56	43.85 ± 0.26	25.06 ± 0.12	291.9 ± 0.7
4a	38.58 ± 0.08	13.78 ± 0.30	16.50 ± 0.24	26.18 ± 0.32	44.78 ± 0.51	31.00 ± 0.05	170.9 ± 0.8
4b	47.52 ± 0.11	32.51 ± 0.80	27.59 ± 0.14	12.50 ± 0.04	28.13 ± 0.44	56.29 ± 0.22	204.5 ± 1.3
4c	33.46 ± 0.05	11.15 ± 0.10	26.77 ± 0.72	94.82 ± 0.71	25.93 ± 0.07	25.10 ± 0.80	217.3 ± 1.4
5a	44.24 ± 0.53	34.41 ± 0.70	57.76 ± 0.43	110.7 ± 0.48	30.72 ± 0.62	18.43 ± 0.22	296.2 ± 1.5
5b	32.08 ± 0.33	34.55 ± 0.32	25.91 ± 0.41	103.7 ± 0.83	49.35 ± 0.70	2.77 ± 0.01	240.3 ± 2.0
5c	44.05 ± 0.42	31.81 ± 0.27	14.68 ± 0.32	99.11 ± 0.37	30.59 ± 0.17	48.94 ± 0.42	269.2 ± 0.7
6a	37.34 ± 0.06	9.03 ± 0.20	25.20 ± 0.13	17.01 ± 0.03	42.00 ± 0.51	35.00 ± 0.04	218.9 ± 1.4
6b	76.20 ± 0.23	29.49 ± 0.61	40.56 ± 0.73	307.2 ± 1.31	67.60 ± 0.48	30.70 ± 0.18	551.9 ± 2.3
6c	116.7 ± 0.92	26.20 ± 0.39	17.86 ± 0.44	78.60 ± 0.43	29.71 ± 0.32	29.77 ± 0.27	298.9 ± 1.7
7a	36.63 ± 0.07	29.37 ± 0.26	40.30 ± 0.72	102.5 ± 0.72	30.53 ± 0.05	39.69 ± 0.62	279.1 ± 1.5
7b	32.40 ± 0.05	44.86 ± 0.32	29.91 ± 0.51	112.1 ± 0.61	37.38 ± 0.44	24.90 ± 0.20	281.6 ± 1.2
7c	50.69 ± 0.61	34.61 ± 0.27	17.30 ± 0.04	92.72 ± 0.47	28.43 ± 0.37	40.18 ± 0.51	264.0 ± 1.7
8a	62.98 ± 0.45	53.29 ± 0.42	25.43 ± 0.64	17.25 ± 0.04	33.30 ± 0.41	27.25 ± 0.31	272.3 ± 1.1
8b	36.37 ± 0.34	12.12 ± 0.33	13.33 ± 0.06	12.12 ± 0.03	48.49 ± 0.60	16.62 ± 0.05	183.1 ± 0.6
8c	29.62 ± 0.21	24.69 ± 0.50	59.25 ± 0.76	29.62 ± 0.12	37.03 ± 0.42	21.60 ± 0.03	201.8 ± 0.9
9a	27.03 ± 0.13	49.23 ± 0.52	35.15 ± 0.04	81.24 ± 0.64	55.39 ± 0.42	52.31 ± 0.71	303.4 ± 1.0
9b	42.22 ± 0.37	37.25 ± 0.24	24.83 ± 0.11	99.35 ± 0.83	31.04 ± 0.53	27.94 ± 0.50	262.7 ± 0.5
9c	287.2 ± 2.10	12.04 ± 0.10	66.26 ± 0.63	93.97 ± 0.53	33.13 ± 0.04	21.08 ± 0.07	515.7 ± 1.7
10a	46.29 ± 0.70	37.03 ± 0.70	27.77 ± 0.32	115.7 ± 0.74	57.89 ± 0.08	57.87 ± 0.53	342.6 ± 1.4
10b	33.80 ± 0.40	31.38 ± 0.30	26.55 ± 0.06	96.75 ± 0.44	36.21 ± 0.33	51.30 ± 0.42	275.8 ± 1.3
10c	27.39 ± 0.53	48.99 ± 0.44	34.29 ± 0.16	17.54 ± 0.34	42.87 ± 0.51	51.31 ± 0.87	180.0 ± 0.7