GE Analytical Instruments ©2006 12-11 DLM 14291 Rev. A
water before use to minimize nitrite contamination. Another common problem is
nitrite contamination in the water used to prepare the standards. Check for
contaminated water simply by injecting a sample of the water. Most laboratory
water systems can produce water with <1 µM nitrite if properly maintained. Ion
exchange resins must be replaced at regular intervals, and the manufacturer’s
recommendations should be followed to ensure high purity water is produced.
Water exposed to the atmosphere can absorb nitric oxide, which will be converted
to nitrite. It is best to use water fresh from the purification system and minimize
its exposure to air to avoid contamination.
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