Problems for Curve Fitting Strategies
- Page ID
- 76373
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- A set of iron emission standards is run on an ICP, giving the following emission intensity data. Suggest an appropriate form for the working curve and the useful range of concentrations. Answer
[Fe], ppm Fe emission signal, 248.3 nm 0 142 0.25 470 0.5 775 0.75 1079 1.0 1384 1.5 1979 2.0 2571 2.5 3148 - A set of standards for calcium in blood serum is prepared using a 40 g/L solution of human serum albumin (HSA, the most plentiful protein in blood), containing 1 ppm Y as YCl3. To 50 mL of this solution, enough CaCl2 is added (followed by dilution with water to 100 mL) to produce the following standards:
[Ca2+], ppm Ca emission signal, 393.3 nm Y emission signal, 377.4 nm blank 2415 3248 0.2 3223 3245 0.4 4307 3250 0.6 4845 3248 0.8 5656 3249 1.0 6474 3247 If a 1 mL blood serum sample is added to 39 mL of the HSA/Y solution and diluted to 100 mL, the Ca and Y signals are 4988 and 3315 respectively. What is the concentration of Ca2+ in the blood serum sample? Be careful -- ensure that you've accounted for all dilution factors! Answer