Table 1. Arsenic Concentrations (mug kg-1) in Murshidabad Surface and Groundwaters


	Beldanga	Hariharpara	Jalangi	Nabagram	Kandi	Irrigationa	Ponds	Rivers

Minimum	3	43	37	0.94	10	3	2	BDb
Maximum	4622	695	649	3	11	579	4	2
Mean	1248	345	283	1.99	10.5	165	3	3
SD	1910	167	307	1.01	0.7	277	1	
Median	76.5	343	107	2	10.5	38	3	
n	12	14	5	5	2	4	8	

aOnly four of the sampled irrigation wells had detectable As concentrations. These were as follows: well irw-jb from the Jalangi block, 579 mug kg-1; well irw-1na from the Naoda block, 24 mug kg-1; well irw-2na from the Naoda block, 52 mug kg-1; well iw-2nbk from the Nabagram block, 3 mug kg-1.
bBD = below detection [>0.01 mug kg-1; Haque et al., 2008].