00000nam 2200000zi 4500 9.878922 CaOODSP 20241203113652 m o d f cr bn||||||||| 190905t19741974onc ob f000 0 eng d CaOODSP eng rda CaOODSP n-cn--- En36-508/28E-PDF 36-508/28 McGirr, D. J., author. Interlaboratory quality control study no. 6 : specific conductance, pH, colour and residue / D.J. McGirr. Burlington, Ontario : Inland Waters Directorate, Canada Centre for Inland Waters, 1974. ©1974 1 online resource (v, 6 pages). text txt rdacontent computer c rdamedia online resource cr rdacarrier Report series ; no. 28 Page iv blank and unnumbered in original print edition and omitted in this copy. Digitized edition from print [produced by Environment and Climate Change Canada]. Includes bibliographical references (page 5). "Three synthetic samples and two filtered natural samples were sent to eighteen participating laboratories for the determination of specific conductance, pH, colour and filterable residue. The pH of the natural samples was determined with a standard deviation of 0.3-0.5 pH units, which is distinctly higher than the value of about 0.1 pH units which is found for buffered synthetic samples. The precision of the colour measurements was fair, as would be expected for the visual method used. Generally good precision was obtained for specific conductance using the conductivity meter. Results for residue were surprisingly poor on the synthetic samples but satisfactory on the natural samples. It appeared from the nature of the results and from the participants' comments that weighing difficulties were an important problem in residue determination"--Summary, page v. Issued also in print format. gccst Water gccst Water quality gccst Analysis Canada. Environment Canada. Canada. Inland Waters Directorate. Report series (Canada. Inland Waters Directorate) no. 28. (CaOODSP)9.862410 PDF 525 KB https://publications.gc.ca/collections/collection_2019/eccc/en36-508/En36-508-28-eng.pdf