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Jharkhand || North-East Hilly States || Rajnandgaon, Chattisgarh || Behala, Kolkata, WB || As toxicity- Homeopathic Treatment
Effectiveness & Reliability - As Field Testing Kits || Utility Of Treatment Plant
Causes, Effects & Remedies - Groundwater As Calamity || References

Arsenic Poisoning in West Bengal : Field Testing Kits for Arsenic

FIELD TESTING KITS FOR ARSENIC: HOW EFFECTIVE ARE THE MILLION-DOLLAR PROJECTS?

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Comment-3

In the NEERI/WHO report for West Bengal it is written:

" It is observed that the results of arsenic in the acidified samples analysed using the ICP technique are always higher compared to the results obtained in the unacidified samples tested with the field kits. This is due to the fact that all the water samples collected in West Bengal also contained high iron (0.09 to 7.5 µg/l), and by the time the water samples were brought to the PHED laboratories at Barasat and Kalyani for arsenic testing with the field kits some of the arsenic might have co-precipitated with iron resulting in low values of arsenic."

And, for Bangladesh, the report states:

" It is observed that the results of arsenic in the acidified samples analysed using ICP are always higher than the results of arsenic obtained in the unacidified samples tested using the field kits (Table-2). This can be explained by the fact that all the water samples collected in Bangladesh contain high concentration of iron (4.1 to 8.9 µg), and by the time the water samples were brought to the DPHE laboratory at Chandpur for testing some of the arsenic might have co-precipitated with iron resulting in low values of arsenic."

Please find herewith in our Table-Y the results of 16 samples out of 24 samples measured by NEERI-ICP and compared with field kits. When we consider the arsenic detection range of Field Kits (page-23 of NEERI/WHO report) as shown below in Table-Z it appears that in these 16 samples out of 24, the deviation is not so prominent.


Table-Z Comparative Evaluation of the Field Kits

Sl.No. Parameter AAN E-Merck Aqua NIPSOM AIIH&PH
4. As detection range 0.02-0.70 µg/l As with colour scale at 0.02, 0.05, 0.1, 0.2, 0.3, 0.4, 0.5, 0.7 µg/l 0.1-3.0 µg/l. As with colour scale at 0, 0.1, 0.5, 1.0, 1.7, 3.0 µg/l >=0.05 µg/l As 0.02-0.70 µg/l As with colour scale at 0.02, 0.05, 0.1, 0.2, 0.3, 0.4, 0.5, 0.7 µg/l >=0.05 µg/l As

Table-Y Comparison of Field kits with ICP for arsenic in groundwater for affected villages in West Bengal and Bangladesh

Sample No. Tubewell location
Arsenic - µg/l
Field Kits
ICP
AAN E-Merck Aqua NIPSOM AIIH&PH
1 Darus Salam Mosq.
Nutun Bazar, Chandpur, Bangladesh
>0.7 0.8 >0.05 >0.7  
0.824
2 Md. Habibur Rahaman
Pal Para, Chandpur, Bangladesh
0.5 0.5 >0.05 0.2-0.3   0.677
6 Pourashava Office
Chandpur, Bangladesh
0.4 0.4 >0.05 0.3   0.499
4 HP in premises of
Mr. S. Mukherjee
Ward 22,P.O: Napara West Bengal
0.5-0.7 0.5-1.0 >0.05 0.3-0.4 >0.05 0.705
6 Tubewell in premises of
Mr. K. Goldhar
Vill: Barbaria Pachimpara
West Bengal
0.2-0.3 >0.1 >0.05 0.2-0.3 >0.05 0.348
7 HP in premises of Mr. A. Gupta
Lalpur (North)
Chakdah
M.A.
West Bengal
0.3-0.4
(Near to 0.4)
0.1-0.5
(Near to 0.5)
>0.05 0.3 >0.05 0.366
8 HP in premises of Mr. P. Chakraborty
Lalpur (North) Chakdah M.A.
West Bengal
0.3 0.1-.05 (Appr. 0.2) >0.05 0.2-.03 >0.05 0.308
11 HP in premises of Mr. S. Ghosh
Vill: Ghetughachi
Block: Chakdah
West Bengal
0.2-0.3
(Near to 0.2)
0.1 >0.05 0.1-0.2 (Near to 0.2) >0.05 0.261
13 HP in premises of Mr. D. Ganguly
Vill: Gangapur
G.P.: Duttapukur
West Bengal
0.3-0.4
(Near to 0.4)
0.1-0.5 (Appr. 0.3) >0.05 0.2-0.3 (Near to 0.3) >0.05 0.482
15 HP in premises of Mr. Ranjan Sen
P.O.: Ashokenagar
West Bengal
0.2-0.3
(Near to 0.25)
0.1-0.5
(Near to 0.2)
>0.05 0.1-0.2 (Near to 0.2) >0.05 0.225
16 TW inside Kali temple P.O. AshokenagarWest Bengal 0.2-0.3
(Appr. 0.25)
0.1-0.5
(Appr. 0.3)
>0.05 0.1-0.2
(Near to 0.2)
0.05 0.217

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