FT-IR technique can be utilized for the analysis of unknown analytes by matching it with__________. Both choices are correct Commercial library/database Reference standard
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FT-IR technique can be utilized for the analysis of unknown analytes by matching it with__________.
-
Both choices are correct
-
Commercial library/database
-
Reference standard
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- The internal standard method compensates for errors that affect both the analyte and the reference. True Falsecont irmation True or false: The purpose of the internal standard is to make quantitation of the analyte insensitive to injection errorsRetention time is the time taken for the mobile phase to reach the detector. True False
- 1) The ratio strength of a 10mL vial of neostigmine methylsulfate injection USP is 1:1500. Calculate the amount of neostigmine methylsulfate in milligrams contained in the 10mL vial. (Round to the whole number).In HPLC, fill in the blanks with the choices below: - chromatogramretention timevoid volume markernumber of theoretical platespeak widthplate height Resolutioncapacity factorreduced retention volumeselectivity - 1. This chromatographic parameter is a measure of efficiency ____.2. A high value of the _______ means high efficiency.3. ______ is both a measure of selectivity and efficiency.4. To measure the void time a _______ is use.5. A higher value of _______ means higher HETP.6. Another term for retention factor is _______7. _______ is ability of the chromatographic system to discriminate differentanalytes.8. The plot of the detector response vs. time is called a _______9. _______ distance of the peak maxima from the injection point expressed intime units.10. The difference between the retention volume and the void volume is called _____The response of the instrument must be lincar in the sample matrix. Systematic errors can occur due to sample or standard preparation. It consists of a series of standard analyte solutions separate from the unknown. A blank is used to correct the response from the instrument. Known quantities of a standard solution of the analyte are added to the unknown. It is the method of choice when the matrix of the sample may affect the signal. Matrix effects can cause the same analyte concentration in an unknown and standard to give different responses. It is used to measure the instrument response as a function of a known analyte concentration under a set of conditions.
- FindTap-Cengage Leaming x b Answered: Determine the pH dur x + tatic/nb/ui/evo/index.html?deploymentid=55750823468596024212874980&elSBN=9781305657571&snapshotid=3054066&id=155276463... ✰ Back Submit Answer Use the References to access important values if needed for this question. Calculate the pH of an aqueous solution that contains 0.453 M sodium hydrogen phosphate and 0.337 M sodium dihydrogen phosphate. Calculate pH of Buffer. ICE Method: This is group attempt 1 of 5 References P W pH = Autosaved at 10:37 PM DE Regenerate Group (40) Next 10:37 11/3/2Tim 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 fruitA silica TLC plate is developed in a mixture of solvent system/mobile phase. The solvent travels 30 mm up the plate Analyte #1 travels 9 mm up the plate Analyte #2 travels 16 mm up the plate Which analyte is more polar, and what is its Rf? Analyte #1, Rf = 0.53 Analyte #2, Rf = 0.53 Analyte #2, Rf = 0.3 Analyte #1, Rf = 0.3
- Page of 5 O + 3 ZOOM Question 1: Using a well-known protein estimation technique, absorbance reading for a set of standards were obtained. You were required to plot the data. Which graph would you use? Plot the data using the graph type. Protein Absorbance concentration (mg/mL) (a.u.) 0.01 0.05 0.12 5 10 25 0.25 0.63 1.25 50 Question 2: Enzymes are biological catalysts and perform important biochemical reactions in the body. A group of scientists discovered a new enzyme – Enzyme X. To understand the working of this enzyme, they performed biochemical assays to assess the activity of the enzyme. The results for which are shown in the table below. Based on the information provided in the table, please state which graph would you use? Plot the data using the graph type. Enzyme activity (%) 35 55 pH 3 4 5 68 6 79 7 98 85 20 8 9 10urses/ 2951 2. A linear standard curve of KMnO4 is prepared from a set of standard solutions by plotting absorbance (y) vs. concentration (x). Use Logger Pro (as described in the Data Analysis for this experiment), or Google Sheets/Excel, to plot this standard curve using the data in Table 1. Help with spreadsheets [PDF] Table 1: Data for the standard curve of KMnO4 Absorbance Concentration (M) 0.372 6.00 x 10-4 0.298 0.223 0.149 0.0744 After plotting the standard curve, enter its slope below (not the equation of the line). Report your answer to 3 significant figures. If your answer ends in one or more zeros, use scientific notation. Slope = 4.80 x 10-4 3.60 x 10-4 2.40 x 10-4 1.20 x 10-4 M-1 M 3. Suppose that an unknown sample is analyzed spectrophotometrically at the same wavelength that was used for the standard curve and the absorbance was found to be 0.186. Use the standard curve to find the concentration of the unknown. Hint:Answer sections C, D and E in the same answer book. Section D (Chromatography) Question 8 The following data were obtained for the analysis of a mixture of compounds (A-D) by HPLC: Peak Retention time (min) | Width of peak base (min) non-retained 2.1 A 6.4 10.51 B 11.3 1.03 C 13.1 1.25 D 21.6 1.62 a) Using peak C. calculate the number of plates (N) in this column. b) For peak D, calculate the capacity factor (k'). c) For peak B and C, calculate the resolution (R).