BS ISO 23381:2020 pdf free.Determination of salt out (crystallization) temperature of liquid fertilizers.
BS ISO 23381 Liquid fertilizers have been defined in ISO 8157:2015.An aliquot of the original liquid fertilizer sample is placed into a glass test tube and is then immersed into an alcohol-dry ice bath until it crystallizes. The alcohol could be chosen from methanol, ethanol,or isopropanol (IPA]. Acetone could also be used instead of alcohols; however, IPA (rubbing alcohol) is preferred due to its higher boiling point. If dry ice is not available, other lowering temperature mixtures such as salt-ice could be used to achieve the proper cooling and crystallization of the fertilizer test sample.Once the precipitation (formation of salt crystals) is complete, the cooling source is removed and the glass test tube and its contents are allowed to warm up to room temperature. The SOT in most cases is defined when the last crystal to dissolve (LCTD) dissolves (i.e. is no longer visible in the solution).Exceptions to the LCTD rule are covered below and in 8.11.The underlying principal of the technique can be ilustrated with the following cooling curve[2] shown in Figure 1.7.1 Attach a steel rod to its frim base (lab stand). 1) Glas-Col Model 099A GT31 or 099D GT 21 from glas-col.com, 800-425-7265, or Stir-Pak Dual Shaft Mixer, Cole- Parmer UX-04555-44, 800-323-4340 are examples of suitable products available commercially. This information is given for the convenience of users of this document and does not constitute an endorsement by iso of these products. 2) GLS 099D A210101, fits Glas-Col Stirrer Model 099A GT31 099D GT21, Cole- Palmer Stir- Pak Dual Shaft Mixer has already included the Chuck and is an example of a suitable product available commercially. This information is given for the convenience of users of this document and does not constitute an endorsement by ISO of this product.
3) Strong Lab Stand and support with a rigid base such as support stand with rod, 1000 mm length, 16 mm diameter, 180 mm base width from VWR, Catalogue # 241-0101 and is an example of a suitable product available commercially. This information is given for the convenience of users of this document and does not constitute an endorsement by ISO of this product. 4) Such as item # 8600-0099, Pope Scientific, 866-636-2487. It is an example of a suitable product available commercially. This information is given for the convenience of users of this document and does not constitute an endorsement by ISO of this product.BS ISO 23381 pdf download.