PART A. Total Dissolved Solids (TDS) A 25.0 mL aliquot of a well-shaken and filtered sample of river water is pipetted into an evaporating dish. The sample was heated to dryness. The following data were obtained: • Mass of evaporating dish = 25.415 g • Mass of dried sample plus evaporating dish = 25.646 g PART B. Total Solids (TS) and Total Suspended Solids (TSS) A 25.0 ml aliquot of a well-shaken sample of river water is pipetted into an evaporating dish. The sample was heated to dryness. The following data were obtained: • Mass of evaporating dish = 25.415 g • Mass of dried sample plus evaporating dish = 26.394 g Using the data for Part A and Part B, determine the Total Suspended Solids (TSS) in mg/L. Round off your final answer to the nearest whole number.

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Mass Spectrometry

This process is an instrumental method in which a sample is changed to fast moving positive ions by electron bombardment. The charged particles vary due to their different mass to charge ratio and are estimated with the help of this difference. It is also called mass spectroscopy.