A researcher was attempting to quantify the amount of dichlorodiphenyltrichloroethane (DDT) in spinach with gas chromatography using a chloroform internal standard. To begin, the researcher examined a sample containing 7.44 mg/L. DDT standard and 4.00 mg/L chloroform as the internal standard, producing peak areas of 3343 and 10837, respectively. Then, the researcher collected 11.93 g of spinach, homogenized the sample, and extracted the DDT using an established method (assume 100% extraction), producing a 2.00 ml volume of unknown sample. The researcher then prepared a sample that contained 0.500 ml of the unknown sample and 1.25 ml of 11.99 mg/L chloroform, which was diluted to a final volume of 25.00 ml. The sample was analyzed using GCMS, producing peak areas of 6371 and 12657 for the DDT in the unknown and the chloroform, respectively. Calculate the DDT concentration in the spinach sample. Express the final answer as milligrams of DDT per gram of spinach.
A researcher was attempting to quantify the amount of dichlorodiphenyltrichloroethane (DDT) in spinach with gas chromatography using a chloroform internal standard. To begin, the researcher examined a sample containing 7.44 mg/L. DDT standard and 4.00 mg/L chloroform as the internal standard, producing peak areas of 3343 and 10837, respectively. Then, the researcher collected 11.93 g of spinach, homogenized the sample, and extracted the DDT using an established method (assume 100% extraction), producing a 2.00 ml volume of unknown sample. The researcher then prepared a sample that contained 0.500 ml of the unknown sample and 1.25 ml of 11.99 mg/L chloroform, which was diluted to a final volume of 25.00 ml. The sample was analyzed using GCMS, producing peak areas of 6371 and 12657 for the DDT in the unknown and the chloroform, respectively. Calculate the DDT concentration in the spinach sample. Express the final answer as milligrams of DDT per gram of spinach.
Chapter8: Sampling, Standardization, And Calibration
Section: Chapter Questions
Problem 8.16QAP
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Transcribed Image Text:A researcher was attempting to quantify the amount of dichlorodiphenyltrichloroethane (DDT) in spinach with gas
chromatography using a chloroform internal standard. To begin, the researcher examined a sample containing 7.44 mg/L DDT
standard and 4.00 mg/L chloroform as the internal standard, producing peak areas of 3343 and 10837, respectively.
Then, the researcher collected 11.93 g of spinach, homogenized the sample, and extracted the DDT using an established method
(assume 100% extraction), producing a 2.00 ml volume of unknown sample. The researcher then prepared a sample that
contained 0.500 ml of the unknown sample and 1.25 ml of 11.99 mg/L. chloroform, which was diluted to a final volume of
25.00 ml. The sample was analyzed using GCMS, producing peak areas of 6371 and 12657 for the DDT in the unknown and the
chloroform, respectively.
Calculate the DDT concentration in the spinach sample. Express the final answer as milligrams of DDT per gram of spinach.
concentration of DDT:
mg DDT/g spinich
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