BS 6057-3.9:1996:2006 Edition
$86.31
Rubber latices. Methods of test – Determination of pH
| Published By | Publication Date | Number of Pages |
| BSI | 2006 | 12 |
PDF Catalog
| PDF Pages | PDF Title |
|---|---|
| 1 | BRITISH STANDARD BS 6057-3.9: 1996 ISO 976:1996 Rubber latices – Part 3: Methods of test – Section 3.9 Determination of pH ICS 83.060 |
| 2 | Committees responsible for this British Standard |
| 3 | Contents |
| 4 | National foreword |
| 5 | 1 Scope 2 Normative references 3 Reagents 3.1 Buffer solution of nominal pH 7 3.2 Buffer solution of pH 4 3.3 Buffer solution of nominal pH 9 3.4 Reference electrolyte: 3 mol/dm3 potassium chloride solution saturated with silver chloride. |
| 6 | 4 Apparatus 4.1 pH-meter, with an input impedance of at least 1012 W, a resolution of 0,01 pH-units and equipped for temperature compensation. 4.2 Combined electrode, in which the glass electrode is surrounded concentrically by the silver reference electrode. The referen… 4.3 Magnetic stirrer and magnetic bar 4.4 Electrode holder 5 Sampling 6 Procedure 6.1 Maintenance of the electrode 6.1.1 Refill the electrode with the reference electrolyte (3.4) through the filling hole, first removing the filling cap if one is fitted. 6.1.2 When it is not in use, keep the electrode with the junction immersed in the electrolyte. 6.2 Calibration of the pH-meter 6.2.1 Switch on the pH-meter (4.1) and allow the electronic circuit to stabilize. Calibrate the pH-meter following the manufacturer’s instructions. Where not available, proceed as follows: 6.2.2 Select two commercial buffer solutions (see clause 3), one of nominal pH 7 (i.e. close to the zero point of the electrode)… 6.2.3 Allow the temperature of the buffer solutions, the test sample and the electrode to equilibrate at the specified temperature (see beginning of this clause). Record the temperature and adjust the temperature correction on the pH-meter to correspond. 6.2.4 Rinse the electrode with distilled or demineralized water (see clause 3) and then with the buffer solution of nominal pH 7, so that the liquid runs down the length of the electrode. 6.2.5 Introduce an adequate volume of the same buffer solution into a suitable clean, dry glass or inert plastic vessel and imme… |
| 8 | 6.2.6 Rinse the electrode with water, followed by the chosen buffer solution [pH 4 (3.2) or pH 9 (3.3)] as described in 6.2.4. 6.2.7 Immerse the electrode in a quantity of the chosen buffer solution as described in 6.2.5. Allow the reading to stabilize be… 6.3 Measurement of the pH of the test sample 6.3.1 Mix the test sample thoroughly to ensure that it is homogeneous. 6.3.2 Rinse the electrode and measuring vessel, first with distilled or demineralized water, and then with some of the sample to… 6.3.3 Repeat the operations specified in 6.3.2 with a fresh portion of the test sample: 7 Expression of results 8 Precision statement 8.1 The precision of this method was determined in accordance with ISO/TR 9272. Refer to this document for terminology and explanations of statistical concepts. 8.2 The precision details in this precision statement give an estimate of the precision of this test method with the materials u… 8.3 The precision results are given in Table 1. The precision is expressed on the basis of a 95 % confidence level for the values established for repeatability r and reproducibility R. 8.4 The results contained in Table 1 are mean values and give an estimate of the precision of this test method as determined in … |
| 9 | 8.5 A type 1 precision was determined, based on the sampling method used for the latex samples in the ITP. 8.6 Repeatability: The repeatability r (in measurement units) of this test method has been established as the appropriate value … 8.7 Reproducibility: The reproducibility R (in measurement units) of this test method has been established as the appropriate va… 8.8 Bias: In test method terminology, bias is the difference between an average test value and the reference (or true) test property value. 9 Test report” a) a reference to this International Standard; b) sufficient information to identify the sample; c) the pH of the rubber latex or polymer dispersion, expressed to the nearest 0,1 pH-units, and the temperature of the determination; d) any particular features noted during the test; e) any departure from the procedures specified in this International Standard or the International Standards to which it refers, as well as any operation considered as optional. f) the date and place of the test. |
| 11 | List of references |
| 12 | BS 6057-3.9: 1996 ISO 976:1996 BSI – British Standards Institution |
