A company that manufactures reagent grade ethanol hired you to monitor the quality of its product. The purity of ethanol is usually compromised by methanol content. Although they label their ethanol product to have less than 40 ppm methanol contamination (their product specification), they control their production process to produce ethanol having 15 ppm methanol contamination (their process control). They monitor their process by regularly testing each batch (produced every hour) to make sure that it is within the normal process variability and within the product specification. The analytical method to test each batch is summarized below:

Part 1: Collect 10 mL ethanol sample from one batch

a. Maximum holding time = ASAP

b. Containers used for sampling are glass with gas tight cap or VOC vials

c. Sample preservation: if longer than 20 mins then store in the fridge until analysis time

d. Leave no head space in the sampling container

Part 2: Sample preparation [static headspace (HS) method]

a. Obtain three 25 mL HS vials then label them 1, 2, and 3

b. Dispense accurately 5 mL of DI water into each of the 25 mL HS vials

c. Dispense accurately 1 mL of the ethanol sample into each of the 25 mL HS vials

d. Cap the HS vials

Part 3: Analysis (Using HS-GC-FID method)

a. Position the samples into the autosampler of the HS-GC-FID instrument

b. Use saved method called Ethanol Purity to analyze the samples

c. If this standard method is followed, the software will automatically calculate and give the concentration of methanol in the ethanol sample to 5 significant figures.

By practice they found out that their method has MDL = 0.5 ppm, linear dynamic range is 1 to 50 ppm and % RSD is usually less than 5% (when analyzing four consecutive technical replicates; n = 4). Every day they check their method for accuracy by analyzing a 19.500 ppm methanol in ethanol certified calibration standard supplied by Sigma Aldrich, this is called a check stand

The above is all the information

I will give a positive rate after you answer all questions!!!!

Question 1: Identifying analytical method -Answer the following questions about the analytical method (fill the excel sheet): a. What is the analyte?- b. What is the matrix? c. Which class does this analytical technique falls in? d. What is the specific name (give full name) of the instrument used? e. Can this method be used to obtain accurate quantification of an ethanol sample that is suspected to have 0.1 ppm methanol? f. You need to use this method to obtain accurate quantification of sample that is suspected to have 100 ppm methanol. What step is required in sample preparation to make this possible