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By William K. Fletcher

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2-5). At concentrations higher than the detection limit precision falls asymptotically towards the value of 2k in the expression: Some implications of this are discussed by Thompson and Howarth (1976). Instrument manufacturers generally quote 2σ0 detection limits for instru- TABLE 2-1 Tables of the probability that M or more points out of N will fall above the 90th and 99th percentiles of a precision control chart (from Thompson and Howarth, 1978) A. 200300 . 000036 ,000060 222300 222C21 3C0022 000004 CCC2C?

16 g/t St. dev. V. 0 GOLD ( g / t ) 12 SET I II 10 9 8 >LU 3 6 \ σ a: ° //////////// 4 3 7Z - § 2 o 3 0 R □ nge Mean St. dev. V. w,fe /%; 5 5 4 0 3 . 0 5 - 4 . 5 1 5. GOLD (g/t) Fig. 2-9. Comparison of duplicate analysis for Au by two analysts using different instruments. ) 42 Contamination Perhaps the most common form of contamination arises if anomalous and background samples are prepared and analyzed together. Sample carryover, of metal-rich dusts during sieving and grinding or metal-rich solutions during decomposition and analysis, results in spuriously high values for background samples.

00004. increasing the effective sample weight and reducing R accordingly. ), will follow a Gaussian distribution with a symmetrical distribution around their mean. When sampling for trace elements present as major constituents of rare mineral grains, this is not necessarily so and normality becomes unlikely or impossible when JR exceeds 50%. In some areas of Fig. 2-7 and Table 2-III only a fraction of a single whole grain of cassiterite is present. However, real grains are not divisible in this manner and under these circumstances the outcome of laboratory sub-sampling becomes very dependent on the size of the sub-sample and scarcity of special grains.

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