6835 (ISO International Standard Ars terr De BeY Surface active agents -- Washing powders Determination of total boron content -- Titrimetric method Agents de surface -- Poudres a laver -- Dosage du bore total -- Meéthode titrimétrique First edition - 1981-04-01 ApW 13 1981 UDC 661.185 : 543.24 : 546.27 Ref. No. ISO 6835-1981 (E) Descriptors : surfactants, tests, determination of content, boron, chemical analysis, titration Price based on 3 pages Copyright International Organization for Standardization tted without license from IHS Not for Resale Foreword Iso (the International Organization for Standardization) is a worldwide federation of national standards institutes (Iso member bodies). The work of developing Inter- national Standards is carried out through IsO technical committees. Every member body interested in a subject for which a technical committee has been set up has the right to be represented on that committee. International organizations, governmental and non-governmental, in liaison with IsO, also take part in the work. Draft International Standards adopted by the technical committees are circulated to the member bodies for approval before their acceptance as International Standards by the ISO Council. International Standard ISO 6835 was developed by Technical Committee ISO/TC 91, Surface active agents, and was circulated to the member bodies in January 1980. It has been approved by the member bodies of the following countries : Germany, F.R. South Africa, Rep. of Australia Hungary Austria Spain Belgium India Switzerland China USA Japan Korea, Rep. of USSR Egypt, Arab Rep. of Romania France The member body of the following country expressed disapproval of the document on technical grounds : Netherlands This International Standard has also been approved by the International Union of Pure and Applied Chemistry (IUPAC) international Organization for Standardization, 1981 C PrintedinSwitzerland Copyright International Organization for Standardization from IHS Not for Resal ISO 6835-1981 (E) INTERNATIONAL STANDARD Surface active agents - Washing powders Determination of total boron content - Titrimetric method 1 Scope and field of application 4.3 Hydrochloric acid, 10 g/l solution. Place 10 ml of the hydrochloric acid solution (4.2) in a 100 ml This International Standard specifies a titrimetric method for volumetric flask, dilute to volume and mix. the rapid determination of the total boron content of commer- cial washing powders, without interference from other com pounds usually present. 4.4 Sodium hydroxide, 100 g/1 solution. The method may be used in the presence of sequestering Dissolve 10 g of sodium hydroxide in water in a 100 ml agents. volumetric flask, dilute to volume and mix. 4.5 Sodium hydroxide, 10 g/l solution. 2 References Place 10 ml of the sodium hydroxide solution (4.4) in a 100 mi volumetric flask, dilute to volume and mix. ISO/R 385, Burettes. Iso 607, Surface active agents and detergents -- Methods of 4.6 Boric acid, solution containing 0,5 g of boron oxide sample division. (B203) per litre. Iso 648, Laboratory glasware -- One-mark pipettes. Weigh, to the nearest 0,1 mg, 0,888 g of boric acid (HgBO3), dissolve it in water in a 1 000 ml volumetric flask and dilute to Iso 1042, Laboratory glassware --- One-mark volumetric volume. flasks. 1 mi of this solution corresponds to 0,5 mg of boron oxide. 4.7 Sodium hydroxide, standard volumetric solution, 3 Principle c(NaOH) 0,05 mol/l. Removal of phosphates from an aqueous solution of a washing powder by passing over an ion-exchange resin, followed by for- 4.7.1 Standardization mation and titration of the boric acid-mannitol complex. By means of a pipette (5.3), place 25,0 ml of the boric acid solu- tion (4.6) in a 150 ml beaker, add 75 ml of water, and proceed as specified in 7.2.3. 4 : Reagents 4.7.2 Calculation of concentration During the analysis, use only reagents of recognized analytical grade, and only distilled water or water of equivalent