ANSI AWWA B702 pdf free download

ANSI AWWA B702 pdf free download.Sodium Fluorosilicate.
SECTION 4: REQUIREMENTS Materials shall comply with the requirements of the Safe Drinking Water Act and other federal regulations for potable water as applicable. Sec.4.1 Physical Requirements 4.1.1 Size and density. The sodium fluorosilicate supplied according to this standard shall be a fine, dry, granular material containing no lumps and shall have an average bulk density of approximately 85 Ib/ft? (1.4 g/cm3) (ranging from 85- -95 lb/f3 [1.4 -1.6 g/cm3]). The material shall meet the following size requirements: 1. At least 98 percent shall pass through a US Standard Sieve No. 40 (420 um). 2. Less than 25 percent shall pass through a US Standard Sieve No. 325 (44 um). 4.1.2 Anticaking agents. Anticaking agents may be used if they do not produce any interference with normal water treatment processes, such as coagulation and sedimentation, and do not impart any taste, odor, or toxicity to water when it is treated with the effective quantity of sodium fluorosilicate.Sec. 4.2 Chemical Requirements The chemical composition shall be determined by the test methods specified in Sec. 5.2. 4.2.1 Sodium fluorosilicate content. The sodium fluorosilicate supplied according to this standard shall have a minimum of 98 percent (dry basis) sodium fluorosilicate, which corresponds to approximately 59.4 percent fluoride ion minimum. 4.2.2 Moisture. Moisture content shall not exceed 0.5 percent by weight.Sec.4.3 Impurities’ 4.3.1 General. The material supplied according to this standard shall contain no soluble materials or organic substances in quantities capable of producing deleterious or injurious effects on the health of those consuming water that has been treated properly with the material. 4.3.2 Insoluble matter Insoluble matter shall not exceed 0.5 percent by weight. 4.3.3 Product certifications. The material is a direct additive used in the treatment of potable water. This material should be certified by an ANSI- accredited certification organization in accordance with the requirements of NSF/ ANSI 60. Appendix A lists the impurities typically checked under NSF/ANSI 60 for sodium fuorosilicate, the US and Canadian drinking water standards for those impurities, the maximum contaminant level/total allowable concentration (MCL/ TAC) for each impurity, and the single product allowable concentration (SPAC). The SPAC is the allowable concentration of the impurity in the treated water when the material is added to give a fluoride concentration of 1.2 mg/L (current) or 0.7 mg/L (recommended).Sec.5.1 Sampling Sampling shall be conducted in accordance with this section of the standard. Each sample container shall be labeled and shall be signed by the sampler. A chain- of-custody form shall accompany all samples and shall be properly completed by the individuals collcting samples. 5.1.1 Sampling point. Samples shall be taken at the point of destination; the point of manufacturing, or the point of repackaging, and the sampling point shall be clearly identified. 5.1.2 Sampling device. Sodium fluorosilicate may be sampled using a sampling tube that is at least 3 in. (19 mm) in diameter. If the sodium fluorosilicate is handled by conveyor or elevator, a mechanical sampling procedure may be used. The procedure must provide a representative sampling of the entire shipment that is being handled. 5.1.3 Amount of shipment to be sampled. If the sodium fluorosilicate is packaged, 5 percent of the packages shall be sampled. No sample for testing shall be taken from a broken package. Samples from individual packages shall be combined to form a composite sample.ANSI AWWA B702 pdf download.