00000nam 2200000za 4500 9.848592 CaOODSP 20241203113640 cr ||||||||||| 171212s1985 onca|||fob|||f000 0 eng d CaOODSP eng n-cn--- En13-5/85-117E-PDF Cheam, V. Evaluation of SO4 data compatibility and approaches for salvaging historical data [electronic resource] / by V. Cheam, A.S.Y. Chau, and S. Todd. [Burlington, Ont.] . : Analytical Methods Division, National Water Research Institute, Canada Centre for Inland Waters, [1985].. ii, 19, [17] p. : ill. NWRI contribution ; 85-117 "Presented at a workshop on statistical aspects of water quality monitoring, October 7-10, 1985, followed by publication of method validation". Digitized edition from print [produced by Environment and Climate Change Canada]. Includes bibliographical references: p. 11-13. "The compatibility and reliability of colorimetric and chromatographic SO4 data were evaluated. The multiple standard addition technique was applied to numerous natural and humic-acid fortified waters. A total of more than 20 different waters was used, in which the colour ranged from 50 to 440 H.U. and the organic carbon from 0.7 to 20 ppm. For the first time, it was demonstrated that Ion Chromatography (IC) data on organic-contaminated coloured waters are reliable.It was also confirmed that the Methyl Thymol Blue (HTB) colorimetric data were biased high. An approach for salvaging historical colorimetric data was found and briefly discussed"--Abstract. gccst Water quality gccst Testing Chau, A. S. Y. (Alfred Shun-Yuen), 1941- Todd, S. Canada. Environment Canada. National Water Research Institute (Canada) NWRI contribution ; no. 85-117 (CaOODSP)9.844121 PDF 1.60 MB https://publications.gc.ca/collections/collection_2017/eccc/En13-5-85-117-eng.pdf