DR AS NZS 1605.4:2017 pdf free

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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 filtered through a Whatman N4l filter paper or equivalent before drawing off sufficient for the required analysis.
1.5.2 Waterborne preservatives
A/sample of preservative taken in accordance with AS/NZS 1605.1 shall be thoroughly stirred before filtering enough solution for the required analysis through a Whatman No. 41 filterpaper or equiv lent filter at ambient temperature.
A creosote samptakcn in accordance with AS/NZS 1605.1 shall be placed in a clean, dry, airtight container allowing about 5% ullage. When sampling, the creosote shall be examined for the presence f seprated undissolved matter, particularly water and crystalline solids, osludgei.h presen& or absence of which shall be reported. If the creosote contains crystalline solids and has been sampled after heating and mixing, this shall be reported. Care shall be taken at all times to avoid the risk of contaminating the contents in any way.
The samplehaII be thoroughly mixed immediately before any portion is withdrawn for testing. If there are any deposits (such as crystalline substances) present, the container shall he warmed on a water bath or by other suitable means just sufficiently to dissolve them. and portions for test shall then be taken from the warmed, mixed sample. A naked flame or other source of intense heat shall not be used to warm the sample.
7.2 REAGENTS All reagents shall be of analytical reagent quality. The water used for preparing the reagents shall be distilled. The following reagents shall be used; (a) Ethanolic hydrochloric acid Dilute 20 mL of 32% hydrochloric acidto 1000 mL in a volumetric flask with ethanol (denatured absolute alcohol). (b) Stock tin standard, 10 000 mg/L Dissolve 10.000g tin metal in 100 mL of concentrated hydrochloric acid in a 600 mL beaker. This process is slow and will need to be done in a fume hood overnight. Transfer the solution quantitatively to a 1000 mL one-marked volumetric flask, add 100 mL concentrated hydrochloric acid and make up to the mark with water. (c) Intermediate tin standard, 250 mg/L Pipette 25 mL of the) stock tin standard, 10 000 mg/L [Item (b) above] into a 1000 mL volumetric flask and make up to volume with ethanoI.
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