00000nam 2200000za 4500 9.849851 CaOODSP 20241203113641 cr ||||||||||| 180110s1986 onca|||fob f000 0 eng d CaOODSP eng eng fre n-cn--- En13-5/86-158E-PDF Cheam, V. A 'time zero' preservation study of twenty-eight trace metals, major ions and nutrients [electronic resource] / by V. Cheam, N. Arafat and A.S.Y. Chau. Burlington, Ont. : Analytical Methods Division, National Water Research Institute, Canada Centre for Inland Waters, 1986. 7, [4] p. : ill. NWRI contribution ; # 86-158 "March 1986". "Control No. AM307". Digitized edition from print [produced by Environment and Climate Change Canada]. Includes bibliographical references: p. 7. "The centralization of the Water Quality Branch (WQB) laboratories has involved longer time periods between sample collection and sample analysis. If the data generated by the consolidated laboratory are to be reliable, it is essential that the sample preservation techniques currently in use be thoroughly evaluated and modified where required. This study investigates in detail the true 'time zero' preservation, where the activities were planned and coordinated to minimize the time gap between sample collection and analysis. Twenty-eight key heavy metals, major ions and nutrients were so studied. It was shown that Ag, Ba, Cd, Cr, Co, Cu, Fe, Mn, Li, Sr,Ni, Pb, Zn, Na, K, Ca, Mg, hardness, S04, C1, F, alkalinity, DOC and SRP are stable up to 90 days from the actual sampling time. Ammonia, TKN and N03 & N02 are stable up to about two and a half weeks"--Abstract. Includes management perspective and abstract in French. gccst Water quality Arafat, Nabil. Chau, A. S. Y. (Alfred Shun-Yuen), 1941- Canada. Environment Canada. National Water Research Institute (Canada) NWRI contribution ; no. 86-158 (CaOODSP)9.844121 PDF 890 KB https://publications.gc.ca/collections/collection_2018/eccc/En13-5-86-158-eng.pdf