CHM217H1 Chapter Notes - Chapter 0-1: Centrifugation, Analyte, Molar Concentration

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azuresquirrel208

18 Sep 2012

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Slurry: a suspension of solid in a liquid. Sample preparation: transforming a sample into a state that is suitable for analysis. Centrifugation and filtration are used to separate undesired solid residue from the aqueous solution of analytes. Calibration curve/standard curve: a graph of detector response as a function of analyte concentration. Concentration: how much solute is contained in a given volume/mass of solvent. Atomic mass: number of grams containing avogadro"s number of atoms. Molecular mass: sum of atomic masses of atoms in the molecule. Formal concentration (f): molarity of a strong electrolyte.

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I need help with questions 5-12 please help thanks

The measurement of Li in brine is used by geochemists to help determine the origin of brine in oil fields. The analysis of replicate samples of a marine sediment sample gave the results shown below:

Sample Preparation	[Li] Found in Original (Micrograms/g)	Analytical Method
1. None	25.1	Standard Curve
2. Dilute to 1/10 with water	64.8	Standard Curve
3. Dilute to 1/10 with water	82.5	Standard Addition

a) suggest a reason for the increasing concentration of Li in samples 1 through 3

b) What value would you reccomend for the real concentration of Li in the sample and why?

c) Name an analytical method other than a calibration curve or standard addition that can be employed to obtain an accurate and precise measurement of Li in these marine sediment samples.

A quantitative analysis for an analyte gives a meanconcentration of 12.6 ppm. The standard deviation for the method isfound to be 1.1 ppm, and that due to sampling is 2.1 ppm.

a. What is the overall variance for the analysis?

b. By how much does the overall variance change if sm isimproved by 10% to 0.99 ppm?

c. By how much does the overall variance change if ss isimproved by 10% to 1.9 ppm?

CHM217H1 Chapter Notes - Chapter 0-1: Centrifugation, Analyte, Molar Concentration

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