By William K. Fletcher
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Geological Survey are summarized by Allcott and Lakin (1978). Most certified standards are only available in small quantities and only the values for their total trace element contents are certified — publication of provisional values for ascorbic acid/hydrogen peroxide soluble Cu, Co and Ni in the Canadian ultramafic rocks UM-1, UM-2 and UM-4 is a notable exception (Cameron, 1972; Faye, 1975). Because of their scarcity primary standards are best used to calibrate secondary standards of similar bulk composition.
Radiation: X-rays radon gas 1 check equipment for X-rays leakage with a scintillometer; regular operators wear dosimeters avoid working on high-grade uranium samples in poorly ventilated areas Guidelines only — consult Hazards in the Chemical Laboratory (Muir, 1977) or similar manual for detailed information. See p. 63 for use of perchloric acid. Chapter 2 QUALITY CONTROL IN THE LABORATORY INTRODUCTION To make the most efficient use of geochemical analyses their reliability must be known. Quality control throughout sample preparation and analysis is therefore as important in the geochemical laboratory as in any other production facility and should be regarded as an essential aspect of any geochemical prospecting programme.
5mm < 5 m n Kept for further investigations Y Chemical and mineralogical analysis Fig. 3-3. Flow chart of the stages in heavy mineral separation and processing used by the Geological Survey of Sweden. 5 54 conductivity and dissolved oxygen. pH and the anions are usually best determined as soon as possible at the sample site or shortly after collection. However, unless colorimetric field procedures are used, determination of trace metals will usually require storage and shipment of waters to a laboratory.