Table IV. Calculation of Cu Content in Powders Sampie no.
Actual concn
0.79 0.99 1.40 2.26 2.64 4.85 35.51 51.43 78.3
Ratio of actual Calcd with Calcd with formula to calcd corrected formula Error, for solutionsa concn for powdersb %
0.59 f 0.015 0.79 f 0.032 1.08 f 0.042 1.69 f 0.039 2.03f 0.059 3.91 f 0.11 28.8 f 0.23 39.7 f2.3 62.1 f 1.5
1.35 1.26 1.30 1.34 1.30 1.24 1.23 1.30 1.26
0.76 f 0.030 1.02f 0.049 1.39f 0.067 2.17 f 0.080 2.61 f 0.11 5.02f 0.20 37.0 f 1.1 51.0 f 3.4 79.8 f 3.0
3.8 3.0 0.7 4.0 1.1
3.5 4.2 0.8 1.9
The results are averages of 3 different samples with the same Cu and Fe concentrations, each counted twice. The correction factor is obtained by taking the arithmetic mean of all actuai/calculated values; it is 1.29 f 0 04.
obtain reasonable precision, a relatively high statistical accuracy (
