A researcher was attempting to quantify the amount of (DDT) in spinach with gas chromatography using a chloroform internal standard. To begin, the researcher examined a sample containing 5.47 mg/L DDT5.47 mg/L DDT standard and 2.90 mg/L chloroform2.90 mg/L chloroform as the internal standard, producing peak areas of 50555055 and 9971,9971, respectively. Then, the researcher collected 9.52 g9.52 g of spinach, homogenized the sample, and extracted the DDT using an established method (assume 100% extraction), producing a 2.90 ml2.90 ml volume of unknown sample. The researcher then prepared a sample that contained 1.00 ml1.00 ml of the unknown sample and 2.00 ml2.00 ml of 11.22 mg/L chloroform,11.22 mg/L chloroform, which was diluted to a final volume of 25.00 ml.25.00 ml. The sample was analyzed using GCMS, producing peak areas of 77117711 and 1318713187 for the DDT in the unknown and the chloroform, respectively.
Calculate the DDT concentration in the spinach sample.