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list at least 10 scientific journals of chemical analysis of a certain analyte using a specific method dated 2016-2021.
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- What is the actual or real-life application of precipitation gravimetric analysis? Include the specific methodology.The researcher extracts a sample of well water and prepares it for TXRF analysis with a 10.00 mg/L V internal standard, like the calibration standards. The result produces SCa = 69297.81 and SV = 13481.2.Determine the concentration of Ca.Discuss three practical applications of solvent extraction in analytical chemistry.
- An aquifer contaminated with petroleum is found to have the following component concentrations at a particular site: benzene 158 ppm toluene 124 ppm ethylbenzene 91 ppm xylene 45 ppm n-heptadecane 161 ppm pristane 84 ppm Provide an estimate for the age of the spill at this site using (a) BTEX ratio and (b) nC17:Pr ratio. Show your calculations and use units throughout. Give proper s.f. for the answer.4. A new method for the determination of mercury in fish was tested against a N.I.S.T. standard to determine if there was any bias (determinate error) in the new technique. The N.I.S.T. standard fish sample was certified to contain 13.55 ppm Hg. The results of six analyses by the new method gave a mean value of 14.15 ppm and s.d. = 0.42 ppm. Does the new method give accurate results at the 95% confidence level?What are the advantages and disadvantages of volumetric and gravimetric analysis?
- Here is a use objective for a chemical analysis to be performed at a drinking water purification plant: “Data and results collected quarterly shall be used to determine whether the concentrations of haloacetates in the treated water demonstrate compliance with the levels set by the Stage 1 Disinfection By-products Rule using Method 552.2” (a specification that sets precision, accuracy, and other requirements). Which one of the following questions best summarizes the meaning of the use objective?(i) Are haloacetate concentrations known within specified precision and accuracy?(ii) Are any haloacetates detectable in the water?(iii) Do any haloacetate concentrations exceed the regulatory limit?What is the actual or real-life application of volatilization gravimetry? Include the specific methodology.Note that the value of x is 0.74 Q1: The table below shows the Oxygen purity and Hydrocarbon levels observed in five tests performed in the laboratory. 0.99X 0.95X Hydrocarbon Level (x%) Oxygen Purity (y%) 1.46X 1.40X 1.11X 90.01 96.73 93.65 89.85 87.33 Compare the coefficients of variation v; then, compute E(Y -Y)², E(Y – Y)², square standard error Sz, and the correlation coefficient(r).
- Explain the difference between random sampling and haphazard sampling as used in Analytical chemistry.(b) What are the objectives of computational chemistry? Explain how ab initio method is different from DFT.2 what is the purpose of BSC Level 1 & 2, proper layout, performance, and its application in biosafety assessment