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Documents

Electronic technical memoranda released by the NWQL from 1992 to present, and other supporting documents. To access technical memoranda, filter Type by "Technical Memos" below.

Filter Total Items: 148
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TM25-01 Verification of segmented flow analyzer for the analysis of phosphorus and nitrogen by alkaline-persulfate digestion

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TM24-04 Verification of segmented flow analyzer for the analysis of phosphorus at low-level operational range

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TM24-03 Characterization of bias and variability in Total Organic Carbon attributable to change in preservation from chilled to sulfuric acid preservation

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TM23-02 Appendix

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TM24-01 Removal of ‘d’ (sample was diluted) value-qualifier code reported for 1,824 results for dissolved solids released between April 17, 2020, and July 28, 2020.

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TM23-02 Discontinuation of surrogate compound tetrahydrofuran-d8 and addition of surrogate compound 1,3-dioxane to National Water Quality Laboratory schedules 4437 and 4447 that use Method O-4437-16

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TM23-01 Verification of alkalinity and ANC determination using Mantech Automated Titration System

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TM22-03 Alkalinity samples analyzed at the Analytical Trace Element Chemistry and Common Services Laboratory (USGSTECO)

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TM22-04 Revision of results for ammonia by KONE for 817 samples analyzed January – March 2022

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Attachment 1. Original and Corrected Results for NWQL Technical Memorandum 22-04

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