AS NZS 1605.4:2018 pdf free.Methods for sampling and analysing timber preservatives and preservative- treated timber Part 4: Analysis methods for determination of preservative solution concentration. 2.1 PRINCIPLE Copper and arsenic are determined by atomic-absorption spectrophotornetry. Hexavalent chromium is determined by back-titration of excess iron added as ferrous ammoniurn sulphate. This method is applicable to CCA mix tank or working tank...
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