AS/NZS 1605.3:2018 pdf download

09-01-2021 comment

AS/NZS 1605.3:2018 pdf download.Section 16 determin of permethrin in timber extracts – hplc analysis.
Timber samples are extracted with acidified-methanol. After solvent evaporation under vacuum and addition of water, the extracts are fractionated on Amberlite XAD-4 to remove resinous substances. Samples are then combined with an internal standard and imidacloprid is quantilated by reverse-phase high-performance liquid chromatography.
All reagents shall be of analytical quality. Unless otherwise specified. water used for the preparation of reagents shall be distilled water.
The following reagents shall be used:
(a) Mobile phase A ASTM type 2 water adjusted to pH 3 with phosphoric acid.
(b) Mobile phase B Methanol for IIPLC.
(c) imidacloprid Imidacloprid (99.9%. Bayer).
(d) Stock imidacloprid standard Weigh to the nearest 0.1 mg approximately 0.0 10 g imidacloprid [Item (c)]. dissolve in methanol and make up to 100 mL with methanol in a volumetric flask.
(e) Stock internal standard Weigh approximately 0.030 g etofenprox. dissolve in methanol and make up to 100 inL with methanol in a volumetric flask.
(f) 0.1 M sulphuric acid Prepare from sulphuric acid 9X% (conc.).
(g) Fiher (lid Celite 545.
(h) A,nberl ire XAD-4 20—50 mesh.
Timber shall be at least air-dry. and preferably at equilibrium moisture content. Samples to
be analysed shall not be oven-dried.
The timber shall be ground to pass through a 3 mm screen (e.g. Wiley Mill).
To determine moisture content, accurately weigh a sample, dry overnight at 105°C’. cool the dried sample in a desiccator then reweigh.
17.4.1 Sample preparation
The sample shall be prepared as follows:
(a) Accurately weigh a sub-sample of air dry, ground timber (approximately 10 g) into a plastic bottle.
NOTE: For example. 400 ml polyethylene terephthalate hexagonal jar. Visy Industrial Plastics 0X3266.
(b) Add approximately 250 mL methanol and 5 mL 0.1 M sulphuric acid to the subsample, cap the bottle and soak at an ambient temperature for at least 3 h.AS/NZS 1605.3 pdf download.

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