Molybdenum standard curve

Working curve for the determination of magnesium with molybdenum as internal standard. 

Figure 7.13 Calibration curves for boron, tungsten and molybdenum from 0.0 to 4.0gg/ml (ppm) using scandium Sc as an internal standard. The units on the Y axis are flask numbers of standards 0.0, 1.0, 2.0, 3.0 4.0 ppm metal respectively...

A calibration curve for the colorimetric determination of phosphorous in urine is prepared by reacting standard solutions of phosphate with molybdenum(VI) and reducing the phosphomolybdic acid complex to produce the characteristic blue color. The measured absorbance A is plotted against the concentration of phosphorous. From the following data, determine the linear least-squares line and calculate the phosphorous concentration in the urine sample ... 

The quantitative reliability of inductively coupled plasma high-resolution mass spectrometry for phosphorus determinations was judged by comparing it to the standard total filterable phosphorus method (Gooper et al., 1999). That method includes a persulphate oxidation step to convert all forms of phosphorus to phosphate, which is then suitable for the molybdenum blue reaction. Using the same set of standards, calibration curves for both methods were developed over a range of 0-200 pg P/1. Fig-... 

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