The proposed technique is a modification of classical procedures for counting micoorganisms directly on membrane filters. The technique consists of clearing the filter with immersion oil, paraffin oil or cedar oil prior to staining with crystal violet, carbol fuchsin or malachite green. Millipore filters (0.1 micron pore size, VC type) were found to be superior to other filters with regard to the contrast between microorganisms and filter surface.
Over 700 community drinking water supplies were sampled for the pesticide Temik (aldicarb and its oxidative metabolites aldicarb sulfoxide and aldicarb sulfone) in Florida. All community supply wells sampled for Temik were located in counties where Temik was reported to have been used and approximately one‐half of the wells were located in counties where ground water was determined to be highly susceptible to contamination by Temik. Susceptibility was determined using ranking criteria that incorporated ground water recharge characteristics, water use, and Temik use patterns.
Temik was not detected in any of the community supply wells sampled during the study. However, Temik was detected in shallow, private wells, as was the pesticide ethylene dibromide in counties with ground water characterized as highly susceptible to contamination.
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