A 5-point calibration curve was made for the determination of Pb in FAA. The reg

ID: 260810 • Letter: A

Question

A 5-point calibration curve was made for the determination of Pb in FAA. The

regression equation was: y . 0:155x . 0:0016, where y is the signal output as absorbance,

and x is the Pb concentration in mg/L. (a) A contaminated groundwater sample

was collected, diluted from 10 to 50 mL, and analyzed without digestion. The

absorbance reading was 0.203 for the sample. Calculate the concentration of Pb in this

groundwater sample; (b) A sediment sample suspected of Pb contamination was

collected. After decanting the overlying water, a 1-g wet sediment sample was digested

and diluted to 50 mL. FAA measurement gave an absorbance reading of 0.350. A

subsample of this wet sediment was taken to measure the moisture content with oven

drying overnight. The moisture was 35%. Report the Pb concentration in sediment

sample on a dry basis.

Answer:

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