By William K. Fletcher
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Extra info for Analytical Methods in Geochemical Prospecting
2-1). Exploration geochemistry utilizes geochemical patterns, that is natural variation of element abundances, as a guide to the presence or absence of ore mineralization. Relative abundances of elements are therefore more important than their absolute concentrations and strictly, it is only necessary that any variability introduced during sample collection and analysis be significantly less than the variability sought (Fig. 2-2). e. precision) over accuracy. Development of exploration geochemistry has therefore followed, and encouraged, development of simple, rapid analytical methods capable of achieving adequate precision.
The records provided by such a programme are particularly valuable if it becomes necessary to change laboratories (Hill, 1975). The following minimum scheme is proposed for a laboratory in which samples are analyzed in batches of 100: (1) Duplicate, preferably random, analysis of approximately 10% of all samples in different batches to the original analysis. Results are plotted as Ι-ΧΊ — X21 versus (A^ + X2)/2 control graphs (Fig. 2-4). (2) Inclusion of at least one reagent blank and two control standards per batch.
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.
Analytical Methods in Geochemical Prospecting by William K. Fletcher