The method for detecting N-nitrosodimethylamine (NDMA) in drinking water using ultra performance liquid chromatography (UPLC) coupled with tandem mass spectrometry (MS/MS) was improved by optimizing the clean-up procedure to remove the matrix interference in pretreatment process, and was then applied to a survey of NDMA in both raw and finished water samples from five water treatment plants in ...

Our studies using 3,4-dichlorobenzenethiol as a probe for methylating agent production during exposure of /v-nitrosodimethylamine to rat liver S-9 preparations produced results dif ferent from those of an investigation reported in the literature. Methyl-3,4-dichlorophenyl thioether was detected, but the quan tities found were not significantly different from the background levels of methylation...

Evidence from animal studies indicates that various N-nitroso compounds are carcinogenic. We investigated whether consumption of nitrosodimethylamine (NDMA) and foods and beverages containing NDMA are carcinogenic for the lung. In a hospital-based case-control study in Uruguay, dietary intake of NDMA and its food sources was measured in 320 cases of lung cancer and 320 controls afflicted with d...

A survey of 16 US drinking water treatment plants was conducted on the occurrence, formation, and control of emerging disinfection by-products (DBPs). The formation and control trends of certain emerging carbonaceous (haloacetaldehyde) and nitrogenous (haloacetonitrile, halonitromethane, cyanogen halide, nitrosamine) DBPs were different from those of the regulated trihalomethanes (THMs). This w...

Age and paleoenvironment of part the Damlouk Member, Ratga Formation from a surface section in Iraqi Western Desert are investigated. Twenty-nine species Larger Benthic Foraminifera (LBF) belonging to 13 genera recognized studied section. The LBF assemblage is dominated by following groups, Nummulites, Alveolina, Rotalia, Lockhartia. Two corals with fragments bryozoan, red algae mollusca had al...