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A comparison of field and laboratory measurements of arsenic in groundwater of Araihazar, Bangladesh, indicates that the most widely used field kit correctly determined the status of 88% of 799 wells relative to the local standard of 50 microg/L As. Additional tests showthatthe inconsistencies, mainly underestimates in the 50-100 microg/L As range, can be(More)
The elevated arsenic (As) content of groundwater from wells across Bangladesh and several other South Asian countries is estimated to slowly poison at least one hundred million people. The heterogeneous distribution of dissolved arsenic in the subsurface complicates understanding of its release from the sediment matrix into the groundwater, as well as the(More)
Whereas serious health consequences of widespread consumption of groundwater elevated in As have been documented in several South Asian countries, the mechanisms responsible for As mobilization in reducing aquifers remain poorly understood. We document here a previously unrecognized and consistent relationship between dissolved As concentrations in reducing(More)
Muhkkerjee et al. raise three main objections to our recent recommendation that a commercial field kit continue to be used to test well water for arsenic throughout Bangladesh (1, 2): (1) our study did not have broad enough coverage to constitute a representative evaluation of the kit; (2) many wells have been and will continue to be misclassified on the(More)
This paper deals with the development of an optimal policy for the single-vendor single-buyer integrated produc-tion}inventory system. The successive batches of a lot are transferred to the buyer in a "nite number of unequal and equal sizes. The successive unequal batch sizes increase by a "xed factor. The capacity of the transport equipment used to(More)
Soil and soil-water As profiles were obtained from 4 rice paddies in Bangladesh during the wet growing season (May-November), when surface water with little arsenic is used for irrigation, or during the dry season (January-May), when groundwater elevated in arsenic is used instead. In the upper 5 cm of paddy soil, accumulation of 13+/-12 mg/kg(More)
⎯Recently an algebraically derived optimal cost solution policy of the integrated vendor-buyer problem with equal sized batch transfer was presented. The solution technique was illustrated with a numerical example and in comparison with two available methods in the literature a significant cost reduction was shown. This paper highlights that the optimal(More)