TM95-05 Nitrogen Isotope Sample Preservation for Water Samples

As stated in Office of Water Quality (OWQ) Technical Memorandum 94.16, beginning January 1, 1995, the NWQL will no longer provide analysis of nutrient samples preserved with mercuric chloride. This policy will also be applied to the preservation of nitrogen isotope samples. The use of mercuric chloride for preserving nitrogen isotope samples i being eliminated in favor of filtering plus chilling. For details regarding the elimination of mercuric chloride as a preservative for nutrient samples, please refer to Office of Water Quality Technical Memorandum 94.16.