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AS NZS 1605.3:2018 pdf free.Methods for sampling and analysing timber preservatives and preservative- treated timber Part 3: Analysis methods for determination of preservative retention. 2.1 PRINCIPLE Copper, chromium and arsenic compounds arc leached quantitatively from the timber sample with a mixture of diluted sulphuric acid and hydrogen peroxide solution. After adding sodium sulphate to the resulting extracts, the elemental concentrations...

DR AS NZS 1605.4:2017 pdf free.Methods for sampling and analysing timber preservatives and preservative-treated timber Part 4: Analysis methods for determination of preservative solution' concentration. A sample of preservative taken In\accordance with AS/NZS 1605.1 shall be heated to between 40°C ancj60°C Wallow foreign matterçbarkchips and similar) to be screened off. The screened sample shall be heated—to 40°C, thoroughly stirred and...