5.2 Collect the homogenized smaple into a thoroughly cleaned, sealable plastic cup or glass bottle. Store the sample in a refrigerator or freezer until required. Ensure that the prepared sample is still homogeneous prior to weighing. If liquid separates from the sample, thoroughly reblend before use. 7.5 Boiling granules, selenized.
Hengar granules are suitable.
Standardize against 0.1 or 0.2 N NaOH standard solution. 7.7 Conway indicator. 7.7.1 Stock solution. 7.7.2 Working solution. Dilute 1 volume of stock with 1 volume of absolute ethanol and 2 volumes of distilled water.