After establishing the response factor of the instrument, the researcher collected 14.58 g of spinach, homogenized the sample,and extracted the DDT using an established method, producing a 2.75 mL solution containing an unknown amount of extractedDDT. The researcher then prepared a sample for analysis that contained 0.750 mL of the unknown DDT solution and 1.25 mL of11.32 mg/L chloroform, which was diluted to a final volume of 25.00 mL. The sample was analyzed using GCMS, producingpeak areas of 8097 and 14601 for the DDT and chloroform, respectively.Calculate the amount of DDT in the spinach sample. Express the final answer as milligrams of DDT per gram of spinach.amount of DDT:mg DDT /g spinach A researcher was attempting to quantify the amount of dichlorodiphenyltrichloroethane (DDT) in spinach using gaschromatography mass spectrometry (GCMS). First attempts using external calibration proved difficult, as reproducibility andexternal standard agreement were poor. To overcome these problems, the researcher used the internal standard calibrationmethod with chloroform as the internal standard.To begin, the researcher analyzed a sample containing 7.13 mg/L DDT standard and 1.28 mg/L chloroform as the internalstandard, which produced peak areas of 4191 and 10585 for the DDT and chloroform, respectively.Determine the response factor (F).F =

Response factor (RF) = 0.0170 Concentration of chloroform calculation: Amount of chloroform taken…

After establishing the response factor of the instrument, the researcher collected 14.58 g of spinach, homogenized the sample, and extracted the DDT using an established method, producing a 2.75 mL solution containing an unknown amount of extracted DDT. The researcher then prepared a sample for analysis that contained 0.750 mL of the unknown DDT solution and 1.25 mL of 11.32 mg/L chloroform, which was diluted to a final volume of 25.00 mL. The sample was analyzed using GCMS, producing peak areas of 8097 and 14601 for the DDT and chloroform, respectively. Calculate the amount of DDT in the spinach sample. Express the final answer as milligrams of DDT per gram of spinach. amount of DDT: mg DDT /g spinach

After establishing the response factor of the instrument, the researcher collected 14.58 g of spinach, homogenized the sample, and extracted the DDT using an established method, producing a 2.75 mL solution containing an unknown amount of extracted DDT. The researcher then prepared a sample for analysis that contained 0.750 mL of the unknown DDT solution and 1.25 mL of 11.32 mg/L chloroform, which was diluted to a final volume of 25.00 mL. The sample was analyzed using GCMS, producing peak areas of 8097 and 14601 for the DDT and chloroform, respectively. Calculate the amount of DDT in the spinach sample. Express the final answer as milligrams of DDT per gram of spinach. amount of DDT: mg DDT /g spinach

Chemistry

10th Edition

ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter1: Chemical Foundations

Section: Chapter Questions

Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...

See similar textbooks

Similar questions

A student use the same protocol as in the lab manual to extract 4 chloroanilline, benzoic acid and naphthalene. Below are the steps he took Step 1 - Dissolve all three in 15 ml ether and place in separatory funnel Step 2- Add 15 ml of hydrochloric acid and mix well Step 3 - Isolate the aqueous layer and add sodium hydroxide which resulted in a precipitate Step 4- Add 15 ml of sodium carbonate to the ether layer and mix Step 5- Isolate the aqueous layer and add hydrochloric acid, which resulted in a precipitate. Step 6- dry the ether layer and collect the solid that is left
If 80% of a desired compound is extracted into the organic phase in each step (leaving 20% in the aqueous layer), how many extractions are necessary to ensure that at least 99% of the compound has been recovered in the organic phase? 1 extraction 2 extractions 3 extractions 4 extractions
Identify the 6 parameters used when quantifying toxic organic compounds.
Seperation of Amino Acids by thin layer chromotography Lab. Please answer #11, #12, and #13 as I am very confused. Thank you for your help!
0.2143 grams of an unknown organic acid was dissolved in about 50 mL of water in a 250 mL Erlenmeyer flask and titrated against 0.1000 M NAOH solution using bromothymol blue indicator. 30.60 mL of titrant was used to achieve end point. The melting point range of the unknown is 98-102 °C. Ignition test reveals the compound to be aliphatic. Cerric ammonium nitrate test is also positive. Which of the following is the unknown? Hint: Consult Shriner's table. citric acid monohydrate [3-carboxy-3-hydroxypenatnedioic acid monohydrate] Phenoxyethanoic acid Glutaric acid [pentanedioic acid] OOxalic acid dihydrate [ethanedioic acid dihaydrate] O citric acid (anhydrous) [3-carboxy-3-hydroxypenatnedioic acid]
Why is 95% alcohol a good solvent for extraction?
Describe the procedure of how to collect and dry your newly recrystallized compound.
If you have 6.61 g of caffeine dissolved in 72.3 mL of water and the extraction coefficient between H2O and CH2Cl2 is 21.51. How many grams of caffeine will extract into the CH2Cl2 layer if you add 87.6 mL?