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8. 9 1 Calculation 8 1 Prepare a standard curve by plottmg peak heIght or percent transmittance agamst known concentrations ofstandards 8 2 Compute concentratIOn ofsamples by companng sample response to standard curve Precision and Accuracy 9 1 PrecIsion and accuracy data are not avaIlable at this tIme BIblIography Jlrka, A M , and M J Carter, "Micro-SemI-Automated AnalySIS of Surface and Wastewaters for Chenllcdl Oxygen Demand" Anal Chern 47 1397, (1975) 7 2· Automated 721 Add 25 ml ofsample to the 16 x 100 mm tubes 7 2 2 Add 1 5 ml ofdIgestIOn solution (6 1) and mix 7 2 3 Add 3 5 ml ofcatalyst solution (6 2) carefully down the side ofthe culture tube 7 2 4 Cap tightly and shake to mix layers 7 2 5 Process standards and blanks exactly as the samples 726 PlaceInovenorblockdlgestorat150°Cfortwohours 7 2 7 Cool, and place standards In sampler In order of decreasmg concentration Complete fillIng sampler tray with unknown samples 7 2 8 Measure color mtenslty on AutoAnalyzer at 600 nm Manual 7 3 7 3 1 732 7.3 3 734 7 3 5 7 3 6 7 3 7 The followmg procedure may be used If a larger sample IS deSired or a spectrophotometer IS used In place ofan AutoAnalyzer Add10mlofsampleto25x150mmculturetube Add 6 ml ofdigestion solution (6 1) and mix Add 14 ml of catalyst solutIOn (62) down the SIde of culture tube Cap tightly and shake to mix layers Place m oven or block dlgestor at 150°C for 2 hours Cool, .tHow any precipItate to settle and measure IntensIty In spectrophotometer at 600 nm Use only optIcally matched culture tubes or a sIngle cell for ~pectro photometnc measurement 410 4-2PDF Image | Methods for Chemical Analysis of Water and Wastes
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