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Figure 6. Sampling a tubewell in Dhaka, Bangladesh.
All groundwater samples were collected, preserved, and stored using a protocol developed by the authors of this study, the World Health Organization, World Bank, United
States Agency for International Development, Government of Bangladesh Department of Public Health Engineering, Geological Survey of Bangladesh, and Rural Electrification
Board of Bangladesh.
All analyses during the 1997 field program were performed at the Environmental Health Programme laboratory of the International Centre for Diarrhoeal Disease Research,
Bangladesh (ICDDR,B), unless otherwise stated.
These samples were analyzed within the Maximum Recommended Storage Time specified in Standard Methods for the Examination of Water and
Wastewater, 19th edition.
Approximately 600 samples were analyzed for total arsenic by the silver diethyldithiocarbamate method and ferrous iron by 1,10-phenanthroline.
Approximately 100 samples were analyzed for chloride by mercuric thiocyanate, total acid-hydrolyzable phosphate by amino acid, sulfate by barium turbidity, sulfide by
methylene blue, and total iron after acidic digestion by 1,10-phenanthroline.
Approximately 75 samples were analyzed immediately after collection for pH by glass electrode or pH paper, oxidation-reduction potential by electrode, dissolved oxygen by
membrane electrode, specific conductivity by electrode, temperature by thermocouple, and nitrate by cadmium reduction. These analyses were performed during sample
collection at the tubewell.
E-mail the President of Better Life Laboratories, Seth H. Frisbie, Ph.D. (shf3@cornell.edu).
Write us at Better Life Laboratories, 293 George Rd., East Calais, VT 05650, USA.
