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Source: U.S. Environmental Protection Agency, 1993, Subsurface characterization and monitoring techniques, a desk reference guide, Vol. 1, USEPA 625/R-93/003a, May (U.S. EPA).

T = Teflon; S = stainless steel; P = PVC, polypropylene, polyethylene; G = borosilicate glass.

aIt is assumed that at each site, for each sampling date, replicates, a field blank, and standards must be taken at equal volume to those of the samples. bTemperature correction must be made for reliable reporting. Variations greater than ±10% can result from a longer holding period.

cIn the event that NHO2 cannot be used because of shipping restrictions, the sample should be refrigerated to 4°C, shipped immediately, and acidified on receipt at the laboratory. Container should be rinsed with 1:1 HNO3 and included with sample. d28-day holding time if samples are preserved (acidified). eLonger holding times in U.S. EPA (1986b).

filtration is not recommended for samples intended to indicate the mobile substance lead. See Puis and Barcelona (1989a) for more specific recommendations for filtration procedures involving samples for dissolved species.

Source: U.S. Environmental Protection Agency, 1993, Subsurface characterization and monitoring techniques, a desk reference guide, Vol. 1, USEPA 625/R-93/003a, May (U.S. EPA).

T = Teflon; S = stainless steel; P = PVC, polypropylene, polyethylene; G = borosilicate glass.

aIt is assumed that at each site, for each sampling date, replicates, a field blank, and standards must be taken at equal volume to those of the samples. bTemperature correction must be made for reliable reporting. Variations greater than ±10% can result from a longer holding period.

cIn the event that NHO2 cannot be used because of shipping restrictions, the sample should be refrigerated to 4°C, shipped immediately, and acidified on receipt at the laboratory. Container should be rinsed with 1:1 HNO3 and included with sample. d28-day holding time if samples are preserved (acidified). eLonger holding times in U.S. EPA (1986b).

filtration is not recommended for samples intended to indicate the mobile substance lead. See Puis and Barcelona (1989a) for more specific recommendations for filtration procedures involving samples for dissolved species.

cate ambient and equipment conditions that can potentially affect the quality of the associated samples.

—Ahmed Hamidi

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