Answered: A 0.5 g sub-sample of lake sediment was…

Introduction to Chemical Engineering Thermodynamics

8th Edition

ISBN:9781259696527

Author:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart

Publisher:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart

Chapter1: Introduction

Section: Chapter Questions

Problem 1.1P

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A 0.5 g sub-sample of lake sediment was digested in 10 mL of nitric acid, and then diluted by a factor of 25. The solution was analyzed by ICP-MS and found to have an Arsenic concentration of 9.365 ug/L. A second 0.5 g sub-sample of lake sediment was spiked with 10 ug of Arsenic and digested in 10 mL of nitric acid and diluted by a factor of 25. The spiked solution was analyzed by ICP-MS was found to have an Arsenic concentration of 37.46 ug/L. (a) what is the percent recovery of the spike? (b) what is the apparent and true concentration of Arsenic in the lake sediment in mg/kg? (c) if the sediment had a moisture content of 40% what would be the apparent and true concentration?

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