Species of arsenic found in drinking water include AsO33- (arsenite), AsO43- (arsenate), (CH3)2AsO2- (dimethylarsinate), and (CH3)AsO32- (methylarsonate). Pure water containing no arsenic was spiked with 0.40 µg arsenate/L. Seven replicate determinations gave 0.35, 0.35, 0.40, 0.36, 0.39, 0.37, and 0.36 µg/L.
a)Find the standard deviation. µg/L
b) Find the concentration detection limit. µg/L
The standard deviation of the data is calculated:
SD = 0.02 ug / L
The average is calculated:
Average = 0.37 ug / L
It has as detection range:
0.37 +/- 0.02
The rage = 0.035 - 0.039
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Species of arsenic found in drinking water include AsO33- (arsenite), AsO43- (arsenate), (CH3)2AsO2- (dimethylarsinate),...
Species of arsenic found in drinking water include AsO33- (arsenite), AsO43- (arsenate), (CH3)2AsO2-(dimethylarsinate), and (CH3)AsO32- (methylarsonate). Pure water containing no arsenic was spiked with 0.40 µg arsenate/L. Seven replicate determinations gave 0.35, 0.35, 0.40, 0.36, 0.39, 0.37, and 0.36 µg/L. (a) Find the mean. µg/L Find the standard deviation. µg/L Find the mean percent recovery of the spike. % (b) Find the concentration detection limit. µg/L
To test the accuracy of a method for detecting arsenic species in water, 0.40 mg of arsesnic was added to each of seven 1-L pure water samples that contained no arsenic. The seven water samples were measured to contain 0.39, 0.40, 0.38, 0.41, 0.36, 0.35, and 0.39 mg/L, respectively. (a) What is the percent recovery of the spiked samples, (b) based on the limited number of measurements, what is the bias of the method, and (c) what is the percent...