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4. PrecIsion and Accuracy 4 1 In a round-robIn study reported by Standard Methods a synthetic unknown sample contaInIng 40 ug/l, as As, with other metals was analyzed In 46 laboratorIes Relative standarddeviatIOnwas ±138%andrelativeerrorwas0% 5. Reference 5 1 The procedure to be used for this determInatIOn IS found In Standard Methods for the ExamInation of Water and Wastewater, 14th Edition, p 283, Method 404A (1975) 2064-2PDF Image | Methods for Chemical Analysis of Water and Wastes
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