AWWA B703-11 pdf download.Fluorosilicic Acid
4.3.1 General. Te material supplied according to this standard shall con- tain no mineral or organic substances in quantities capable of producing deleterious or injurious efects on the health of those consuming water that has been properly treated with the material.
4.3.2 Free acid content. Te fuorosilicic acid supplied according to this standard shall contain a maximum of 1 percent free acids (other than fuorosilicic acid), expressed as HF (hydrofuoric acid).
4.3.3 Product certifcations. Fluorosilicic acid is a direct additive used in the treatment of potable water. Tis material should be certifed in accordance with the requirements of NSF/ANSI 60. Appendix B lists the impurities typically checked under NSF/ANSI 60 for fuorosilicic acid, the US and Canadian drinking water standards for those impurities, and the single product allowable concentra- tion (SPAC) for each impurity. Te SPAC is the allowable concentration of the impurity in the treated water when the material is added to give a fuoride concen- tration of 1.2 mg/L.
4.3.4 Additional impurity limits. Additional impurity limits may be spec- ifed by the purchaser to ensure the material supplied is suitable for water treat- ment. If additional impurity limits are specifed, the purchaser must state the test methodology to be used to determine compliance with the additional limits.
5.1.2 Amount of shipment to be sampled. If the acid is supplied in drums, the number of drums sampled will be left to the discretion of the purchaser. In the case of bulk shipments, a composite sample should be taken from the tank truck or tank car.
5.1.3 Sampling container. Samples shall be collected in a clean, plastic or rubber container. Containers lined with acid-resistant plastic, wax, or rubber may also be used.
5.1.4 Sampling method for drums. When sampling from drums, the fuo- rosilicic acid in the containers to be sampled shall frst be mixed by rolling or other suitable means. A portion shall be taken from each container to be sampled so that the total gross sample consists of at least 2 L.
5.1.5 Sampling method for bulk material. When sampling from a tank truck or tank car, at least fve diferent 500-mL portions shall be taken from dif- ferent places in the container (top, middle, and bottom) and combined to form a composite sample that is representative of the entire container.AWWA B703-11 pdf download.