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Description of ASTM-D8001 2016ASTM D8001-16Historical Standard: Standard Test Method for Determination of Total Nitrogen, Total Kjeldahl Nitrogen by Calculation, and Total Phosphorus in Water, Wastewater by Ion ChromatographyASTM D8001Scope 1.1 This test method is applicable for the analysis total nitrogen (organic nitrogen + ammonia-N + nitrate-N + nitrite-N) as nitrate and total phosphorus as orthophosphate in unfiltered water samples by alkaline persulfate digestion followed by ion chromatography (IC). 1.2 Total Kjeldahl nitrogen (TKN) is determined by the calculation. To determine TKN subtract the nitrate-N and nitrite-N in a digested sample from a non-digested sample (see Section 4, Summary of Test Method). 1.3 The limit of detection (LOD), limit of quantitation (LOQ), and reporting range in Table 1 are based on the two-step process for this test method: digestion and analytical step. Because the digestion step requires a sample dilution, the LOD and LOQ are higher than undigested samples. The reporting range, LOD, and LOQ can be modified and perhaps improved depending on several factors (see Section 6, Interferences).
(A) Ten calibration levels, each injected in duplicate.
(B) LOD calculated as 3 × S/N.
(C) LOQ calculated as 10 × S/N.
(D)
(E) Phosphate LOD/LOQ was calculated based on a dilution factor of 15× relative to the system
concentrations.
1.4 The method detection limits (MDL) are shown for reference. The digestion reagent contains background nitrate and results in higher detection limits. MDL will be shown after the interlaboratory study (ILS) is completed. 1.5 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard. 1.6 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. Keywords alkaline persulfate digestion; ion chromatography; nitrate; ortho-phosphate; phosphate; total Kjeldahl nitrogen; total nitrogen; total phosphate; ICS Code ICS Number Code n/a DOI: 10.1520/D8001-16 The following editions for this book are also available...
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