Transcription of TITLE: Hardness, Total (mg/L as CaCO ) …
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TITLE: Hardness, Total (mg/L as CaCO ) …
METHOD # Approved for NPDES (Editorial Revision 1978, 1982). title : hardness , Total (mg/L as CaCO3) (Titrimetric, EDTA). ANALYTE: hardness Total (mg/L as CaCO3). INSTRUMENTATION: Titration STORET No. 00900. Scope and Application This method is applicable to drinking, surface, and saline waters, domestic and industrial wastes. The method is suitable for all concentration ranges of hardness ; however, in order to avoid large titration volumes, use a sample aliquot containing not more than 25 mg CaC03. Automated titration may be used. Summary of Method Calcium and magnesium ions in the sample are sequestered upon the addition of disodium ethylenediamine tetraacetate (Na2 EDTA).
1 liter with distilled water. 6.4.5 Standardization titration procedure: Place 10.0 mL standard calcium solution (6.4.1) in vessel containing about 50 mL distilled water.
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