By Edited by Antonius Kettrup
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Because of the danger of absorption through the skin, fenthion has been marked with an ªHº in the List of MAK and BAT Values . Author: K. Riegner Examiner: W. 4 9 10 General principles Equipment, chemicals and solutions Equipment Chemicals Solutions Sample collection and preparation Operating conditions for gas chromatography with mass-selective detector Analytical determination Calibration Calculation of the analytical result Reliability of the method Precision Recovery rate Quantification limit Shelf-life Discussion of the method References 1 General principles To determine the levels of fenthion in the air measured air volumes are drawn through Tenax adsorption tubes by a battery-operated pump.
The sensitivity does not need to be constant; only if the analytical calibration function is linear in the whole range is the sensitivity constant. It must, however, be reproducible and, being an important parameter, must always be monitored. 3 Selectivity and specificity Two other concepts associated with the reliability of analytical procedures are selectivity and specificity. An analytical procedure is regarded as being completely selective if the various components (elements) in the analytical sample can be determined independently of one another with this procedure.
G. 7 % (e. g. 3 Solutions Stock solution: To prepare the stock solution, 100 mg fenthion is weighed exactly into a 1000 mL volumetric flask. The flask is then filled to the mark with n-butyl acetate (100 mg/L). Elution solution: To prepare the elution solution 1 mL of the stock solution is pipetted into a 100 mL volumetric flask containing approximately 50 mL n-butyl acetate. The flask is then filled to the mark with n-butyl acetate (1 mg/L). 78 mg/L of fenthion are prepared by diluting with n-butyl acetate.
Analysis of Hazardous Substances in Air by Edited by Antonius Kettrup