Question

In: Chemistry

Low concentrations of methylmercury near the detection limit gave the dimensionless instrument readings: 208.1 , 176.5...

Low concentrations of methylmercury near the detection limit gave the dimensionless instrument readings: 208.1 , 176.5 , 165.1 , 177.1 , 222.1 , 162.9 , 225.9 , 204.5 , 137.5 , and 208.3 . Ten blanks had a mean reading of 41.9 . The slope of the calibration curve is 1.45 × 10 9 M − 1 . Estimate the signal and concentration detection limits and the lower limit of quantitation for methylmercury.

Solutions

Expert Solution


Related Solutions

Low concentrations of EDTA near the detection limit gave the following dimensionless instrument readings: 175, 104,...
Low concentrations of EDTA near the detection limit gave the following dimensionless instrument readings: 175, 104, 164, 193, 131, 189, 155, 133, 151, and 176. Ten blanks had a mean reading of 50.0. The slope of the calibration curve is 1.75 x 10^-9 M^-1. 1. Estimate the signal detection limit for EDTA. (with correct sig figs) 2. What is the concentration detection limit? (with correct sig figs) 3. What is the lower limit of quantification? (with correct sig figs)
"Low concentrations of dioxin near the detection limit gave the following dimensionless instrument readings: 193.3, 156.5,...
"Low concentrations of dioxin near the detection limit gave the following dimensionless instrument readings: 193.3, 156.5, 150.3, 162.3, 207.3, 148.1, 211.1, 189.7, 122.7, and 193.5. Ten blanks had a mean reading of 47.3. The slope of the calibration curve is 2.55 × 10x9 M–1. Estimate the signal and concentration detection limits and the lower limit of quantitation for dioxin." I know the signal detection limit is yblank + 3s and the concentration limit is 3s/m, but what is ysample to...
Low concentrations of Ni-EDTA near the detection limit gave the following counts in a mass spectral...
Low concentrations of Ni-EDTA near the detection limit gave the following counts in a mass spectral measurement: 184, 148, 148, 148, 136, 170., 196, 152, 156, 175. Ten measurements of a blank had a mean of 45 counts. A sample containing 1.00 µM Ni-EDTA gave 1797 counts. (a) Find the mean. ___ counts (b) Find the standard deviation. ___ counts (c) Estimate the detection limit for Ni-EDTA. ___ counts ___ M
In a model of a hypothetical chemical oscillator, the dimensionless concentrations x, y>=0 evolve over time...
In a model of a hypothetical chemical oscillator, the dimensionless concentrations x, y>=0 evolve over time according to dy /dx=1-(b+1)x+ax^2y dx/dy=bx-ax^2y where a, b>0 are parameters a) Find all the fixed points, and perform their linear stability analysis. b) Show that a Hopf bifurcation occurs at some parameter value b=b_c where b_c is to be determined.
Which of the following is an instrument to limit the Owner's risk that the contractor will...
Which of the following is an instrument to limit the Owner's risk that the contractor will be unable to complete the project? A Bid bond B Surety bond C General liability insurance D Hazard insurance
a. The pH meter was improperly calibrated, so that the pH readings on the instrument were...
a. The pH meter was improperly calibrated, so that the pH readings on the instrument were 0.3 pH units too low. A. pKa would be too low and Ka would be too high B. pKa would be too high and Ka would be too low C. neither would change b. An endpoint/equivalence point was erroneously read as 27.20 mL whereas the reading was actually 26.80 mL. A. pKa would be too low and Ka would be too high B. pKa...
Match each method validation term to its definition. Precision Detection limit Range Specificity Quantitation Limit Accuracy...
Match each method validation term to its definition. Precision Detection limit Range Specificity Quantitation Limit Accuracy Robustness Linearity The smallest quantity of analyte that can be distinguished from the blank. A measure of how well plotted data follows a straight line, indicating the response is proportional to the amount of analyte in the sample. Concentration interval over which linearity, accuracy, and precision meet specifications. A measure of how well replicate measurements agree with each other. The ability of a method...
Arsenic is a compound naturally occurring in very low concentrations. Arsenic blood concentrations in healthy individuals...
Arsenic is a compound naturally occurring in very low concentrations. Arsenic blood concentrations in healthy individuals are Normally distributed with mean 3.3 micrograms per deciliter (ug/dl) and standard deviation 1.5 μg/dl. Some areas are known to have naturally elevated concentrations of arsenic in the ground and water supplies. We take an SRS of 25 adults residing in an area that is possibly high-arsenic. The mean arsenic level of these 25 adults is 3.75 μg/dl. Is the arsenic concentration in individuals...
A 25.0 mL sample containing Ni2+ was analyzed and gave an instrument siganl of 23.6 units...
A 25.0 mL sample containing Ni2+ was analyzed and gave an instrument siganl of 23.6 units (corrected for a blank). When exactly 0.500 mL of 0.0287 Ni(NO3)2 was added to the solution, the signal increased to 37.9 units. Calculate the molar concentration of Ni2+ assuming that the signal was directly proportional to the analyte concentration. I was told this was a single addition standard addition problem, but I'm not sure how to work it. Thanks!
Arsenic occurs naturally in very low concentrations. In healthy human adults arsenic blood concentrations are approximately...
Arsenic occurs naturally in very low concentrations. In healthy human adults arsenic blood concentrations are approximately Normally distributed with mean 3.9 μg/dL (micrograms per decilitre) and standard deviation 1.4 μg/dL. For the purposes of this question, assume that the distribution of arsenic blood concentrations is exactly as just described. (a) What proportion of healthy adults have arsenic blood concentrations between 2 and 4.5 μg/dL? [3] (b) Choosing a healthy adult at random, what is the chance that their arsenic blood...
ADVERTISEMENT
ADVERTISEMENT
ADVERTISEMENT