BS EN 899 pdf free download
BS EN 899 pdf free download.Chemicals used for treatment of water intended for human consumption — Sulfuric acid.
4 Purity criteria 4.1 General This European Standard specifies the minimum purity requirements for sulfuric acid used for the treatment of water intended for human consumption. Limits are given for impurities commonly present in the product. Depending on the raw material and the manufacturing process other impurities may be present and, if so, this shall be notified to the user and when necessary to relevant authorities. NOTE Users of this product should satisfy themselves that it is of appropriate purity for treatment of water intended for human consumption, taking into account raw water quality, required dosage, contents of other impurities and additives used in the products not stated in the product standard, and other relevant factors. Limits have been given for impurities and chemicals parameters where these are likely to be present in significant quantities from the current production process and raw materials. If the production process or raw materials lead to significant quantities of impurities, by-products or additives being present, this shall be notified to the user. 4.2 Composition of commercial product The usual commercial concentrations of sulfuric acid available have a mass fraction of 96% or 98 %. Other concentrations of sulfuric acid between a mass fraction of 25 % and 80 % are also available. If sold as concentrated acid, the mass fraction of sulfuric acid shall be in the range of 92 % to 98 % sulfuric acid. The concentration of sulfuric acid shall be within a mass fraction of ± 1 % ( m/m ) of the manufacturer’s declared value. 5 Test methods 5.1 Sampling 5.1.1 General Observe the recommendations of ISO 31 65 and take account of ISO 6206. NOTE The sampling is carried out at the premises of the manufacturer of the concentrated sulfuric acid unless the customer has adequate facilities to carry out this operation safely at his own premises. 5.1.2 Sampling from drums and bottles 5.1.2.1 General 5.1.2.1.1 Mix the contents of the container to be sampled by shaking the container, by rolling it or by rocking it from side to side, taking care not to damage the container or spill any of the liquid. 5.1.2.1.2 If the design of the container is such (for example, a narrow-necked bottle) that it is impracticable to use a sampling implement, take a sample by pouring after the contents have been thoroughly mixed. Otherwise, proceed as described in 5.1 .2.1 .3. 5.1.2.1.3 Examine the surface of the liquid. If there are signs of surface contamination, take samples from the surface as described in 5.1 .2.2. Otherwise, take samples as described in 5.1 .2.3. 5.1.2.2 Surface sampling Take a sample using a suitable ladle. Lower the ladle into the liquid until the rim is just below the surface, so that the surface layer runs into it. Withdraw the ladle before it fills completely and allow any liquid adhering to the ladle to drain off. If necessary, repeat this operation so that, when the other selected containers have been sampled in a similar manner, the total volume of sample required for subsequent analysis is obtained. 5.1.2.3 Procedure using a sampling tube Use a tube made of polytetrafluoroethylene (PTFE), approximately 1 500 mm long, with 1 4,5 mm inside diameter and 1 ,25 mm wall thickness tapering to an inside diameter of approximately 5 mm at one end. Fit a rubber tube approximately 200 mm long which can be closed by means of a pinch clip, to the other end. When taking the samples, insert the sampling tube as far as possible into the acid to be tested with the clip released. Do this slowly so that the levels of liquid in the sampling tube and in the acid container are the same. Close the clip, withdraw the sampling tube from the acid, allow any liquid adhering at the outside of the tube to drain off, and by releasing the clip discharge the contents of the sampling tube into a glass bottle of 1 000 ml nominal capacity provided with a ground glass stopper. Stopper the bottle immediately after filling with each charge of the sampling tube. After shaking thoroughly, fill from the collective sample three glass bottles, each with a volume of approximately 250 ml and provided with a ground glass stopper. Stopper, seal and label the bottles. One of these samples is to be tested by the consignee, the other two shall be kept in case subsequent complaint requires further testing to be carried out.BS EN 899 pdf download.
