If you spike the sample you collected with a known amount of the analyte of interest, you are probably using which of the following calibration methods? standar addition standard blank external standard internal standard standard spike
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- Tim is interested in analyzing for Pyraclostrobin (pesticide) in strawberries using QuECHers method for extraction and clean up before analysis with HPLC-uv. The concentration of the Pyraclostrobin in the fruits that he sampled is thought to be between 1-10 ng pesticide per g fruit fresh weight. The HPLC-uv instrument he is using has a LoQ of 5 ppb for Pyraclostrobin. Tim is starting out with 500 mg of the sliced fruitDetermine the concentration of linalool in a highly valued lavender essential oil. The peak areas of a series of standard solutions (calibrations standards) acquired from GC-MS (gas chromatography-mass spectrometry) is presented below. Concentration (mg/L) Peak area 0 201 25 5214 50 14658 75 23647 100 32657 125 42652 150 52478 QUESTION: Calculate the concentration of linalool in yourhighly valued lavender essential oil which returns a peak area of 27235.The diagram shows a simplified output from the detector with peaks for two compounds X and Y. The areas under the peaks are shown in green. What, if anything , can you say about the relative concentrations of X and Y in the mixture? Explain your answer.
- help with Part B Please. 5. Compare the values of Keq for each of the five solutions: a. Are any of the values outside the sample standard deviation for the set? b. Does the value of the equilibrium constant change when the concentration of either the reactants or products is altered? Why or why not? Explain this based on your calculations of Keq: c. What caused variation (three reasons) in your values of Keq? NOTE: the standard deviation is 3.9x102 The procedure is in the images Data: Unknown solution Equilibrium concentration of {FeNCS2+} in unknown solution(M) Equilibrium concentration [Fe3+](M) Equilibrium concentration [SCN-](M) Keq 1 3.7x10-5 9.6x10-4 1.6x10-4 2.4x102 2 6.2x10-5 9.4x10-4 3.4x10-4 1.9x102 3 1.1x10-4 8.9x10-4 4.9x10-4 2.5x102 4 1.1x10-4 8.9x10-4 6.9x10-4 1.8x102 5 1.8x10-4 8.2x10-4 8.2x10-4 2.7x102If an instrument gives a response of 1240 for a standard containing 8 ppm of a substance, how much if this substance is in a sample that gives a response of 1705? Are any assumptions needed?Find the mean sand standard deviation of each sample.
- For an analysis of phthalates by GC-MS, the limits of detection and quantitation are 0.55 and 3.56 mg/g, respectively. Based on the results obtained below, how are the 3 samples reported? Sample Concentration (mg/g) A 4.50 B 0.055 C 0.56If the endpoints you reached during standardization of your NaOH solution were very precise (relative average deviation if 0.03%) but were all overshot (meaning too much NaOH was added an you passedyour equivalence point), is the reported molar concentration of the acid solution from this experiment greater than , less than or equal to the true concentration? Explain.From a 10-mL sample, a 1-mL aliquot was taken and diluted to 100mL. From this, a 5-mL aliquot was taken and diluted to 20mL.The final 20mL was found to have a concentration of 0.004M analyte X.What is the concentration of analyte X in the 10-mL sample?
- Gas chromatography cannot analyze mixtures due to the sensitivity of the instrument. True FalseMethod used was Volhard Method Sample preparation: 5ml sample diluted in 100 ml. 20ml aliquot was used for analysis. Concentration of AgNO3: 0.0609M Calculate mass of NaCl and % NaCl (w/v)A chemical species that causes a systematic error in an analysis by enhancing or attenuating the analytical signal or the background. A. Interferent B. Analyte C. Cation D. Anion
