Quality-assurance results for routine water analyses in US Geological Survey laboratories, water year 1997

Abstract

Positive analytical bias throughout the reference sample range was indicated for aluminum (whole-water recoverable, inductively coupled plasma-atomic emission spectrometry), and a negative analytical bias throughout the reference sample range was indicated for barium (whole-water recoverable, inductively coupled plasma-atomic emission spectrometry). As with the National Water Quality Laboratory, the Quality of Water Service Unit had very few nutrient sample biases.