ABSTRACT
The analysis of drinking water has emphasized the identification and determination of specific chemical pollutants which represent public health hazards. A number of these priority pollutants are present at microg/L levels. For use in calibrating instrumentation and validating experimental data and methods, National Bureau of Standards (NBS) issues Standard Reference Materials (SRMs) certified for concentrations of important inorganic and organic priority pollutants. Three water SRMs are available, which are certified for inorganic contaminants. Three water SRMs are: SRMs 1641b and 1642b. The Certificate of Analysis for SRM 1639 lists certified concentrations of chloroform, chlorodibromo-methane, bromodichloromethane, bromoform, trichloroethylene, and tetrachloroethylene. The certified concentrations of these volatile compounds are based on gas chromatography and on the mass of the halocarbon, corrected for compound purity, added to the methanol. SRMs 1639 and 1647 are intended primarily for adding accurate amounts of the certified compounds to water and determining response factors.
