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- Give examples of sample analyte in a matrix.Explain the difference between an average and a weighted averageWhat are the differences between systematic and random errors and how do they effect accuracy and precision? In what circumstances would you use standard addition (versus a normal calibration curve) to determine the amount of an analyte in a sample? A urine sample, containing analyte Z is analysed by the standard addition method where 5 mL of the original sample was mixed with increasing amounts of a Z standard and each solution diluted to a volume of 50 mL prior to analysis. A plot of the final concentration of the standard in each of the 50 mL samples (x axis) versus The measured signal from the analysis of each 50 mL sample (on y axis) produced a straight line with the general equation: y = 44.72x + 4.06 what was the final concentration of Z in the 50 mL standard addition sample? what was the initial concentration of Z in the original urine sample?
- What will happen to the sample size if the percentage error becomes lower e.g. 5% instead of 10%? Explain how the sample will best represent the population.What is the relation between the standard deviation and the precision of a procedure? What is the relation between standard deviation and accuracy?what steps can be taken to improve the quality of analytical results. explain briefly.
- For EACH type of gravimetric analysis:Give actual applications of each analysis. Include the SPECIFIC methodology for each sample chosen.Two methods measured the Cdse content (g/L) of six different samples of nano-crystals. Do the two methods differ significantly at the 95% confidence levelI am supposed to calculate Average absolute deviation (%). I am not sure if 7.16 is the final answer, or do i need to multiply by 100 because they are asking for percent?
- C. Nickel in a sample was determined using a new procedure where six replicate samples resulted in a mean of 19.65% and a variance of 0.4524. Five replicate analyses where conducted using a standard procedure resulting in a mean of 19.24% and a variance of 0.105. If the pooled standard deviation was +0.546, is there a significant difference between the two methods?Need help filling out the rest of the dataTrial Mass (g) 1 48.8839 2 49.0099 3 49.1121 4 48.9342 5 49.0338 6 48.7798 Calculate mean and standard deviation in the correct number of sigfigs