AWWA B511-17 pdf download.Potassium Hydroxide
5.1.2 Sampling precaution. Sampling of both dry and liquid potassum hydroxide should be conducted quickly, preferably when the atmosphere is not unusually damp. The sample should be sealed as quickly as possible to avoid absorp- tion of moisture and carbon dioxide from the surrounding air.
5.1.3 Sampling procedures. Five percent of the packages shall be sampled; no sample shall be taken from a broken package. Solid potassium hydroxide shall be sampled by breaking of small pieces from the top, bottom, and sides of the pack- age at several locations and then crushing the pieces to sampling size.* Ground, Aake, crystal, beaded, or prilled potassium hydroxide may be sampled by means of a sampling tube that is at least维in. (20 mm)t in diameter.
5.1.4 Sample size and handling. The gross dry sample, weighing at least 10 Ib (4.5 kg), shall be crushed if necessary, mixed thoroughly, and carefully divided to provide four 1-lb (0.45-kg) samples. The samples shall be sealed in airtight, moisture-proof glass or plastic containers resistant to KOH exposure. Each sample container shall be labeled to identify it, and the label shall be dated and signed by the sampler. A minimum of four samples shall be taken: one for testing by the purchaser, two for possible retesting, and one for referee laboratory testing. Appropriate chain of custody shall be maintained. The contents of liquid potassium hydroxide containers shall be mixed thor- oughly fllowing safty procedures by rllig or by other means and then sampled properly, preferably by tube sampling, Samples from tank cars and trucks may be obtained using a thief sampler (Bacon Bomb) conforming to procedures per ASTM D5743 or ASTM D6063.
5.1.5 Absorption of moisture and carbon dioxide. Potassium hydroxide, both dry and liquid, must be mixed and sampled as rapidly as possible to avoid moisture and carbon dioxide absorption. The sample should be stored in an air- tight, moisture-proof glass or plastic container resistant to KOH exposure. Any weighing of a sample should be conducted as rapidly as possible to avoid change in water and carbonate content.AWWA B511-17 pdf download.