BSI PD CLC/TS 50677:2019
$167.15
Clothes washing machines and washer-dryers for household and similar use. Method for the determination of rinsing effectiveness by measurement of the surfactant content at textile materials
| Published By | Publication Date | Number of Pages |
| BSI | 2019 | 42 |
This Technical Specification provides a method for the evaluation of the rinsing effectiveness of household clothes washing machines, washer dryers and commercial washing machines. The amount of residual linear alkylbenzene sulfonate surfactant (LAS) extracted from the unstained test swatches of the strips used in the washing performance test is determined. This is accomplished by measuring the ultraviolet (UV) light absorbance at the wavelength particular to LAS, a key ingredient of the detergent. Assuming a fixed linear relationship between LAS amount and quantity of detergent mixture and using a concentration versus absorbance curve developed as part of this procedure, the absorbance values are then converted into detergent concentrations, which together with the test solution mass data, yields detergent quantities. This assumption is done, because in the frame of this test it is not possible to determine the exact amount of LAS involved, even in the concentration curves, but only the amount of detergent used. On the textiles, this linear relationship is not given, but it is nevertheless used to express the amount of LAS as determined by UV light absorbance measurements in terms of a detergent amount. Using a concentration versus absorbance curve developed as part of this procedure, the absorbance values can then be converted into detergent concentrations, which together with the test solution mass data, yields detergent quantities.
PDF Catalog
| PDF Pages | PDF Title |
|---|---|
| 2 | undefined |
| 8 | 1 Scope 2 Normative references 3 Terms and definitions 4 Symbols and abbreviated terms 4.1 The variables for Rinse Effectiveness calculations are defined as: |
| 9 | 4.2 Symbols relating to Annex A 5 Requirements |
| 10 | 6 Test method 6.1 Equipment and materials 6.1.1 Climate chamber 6.1.2 Ultraviolet (UV) spectrophotometer 6.1.3 Quartz cuvette 6.1.4 Cuvette rack 6.1.5 Orbital shaker 6.1.6 Scale for weighing detergent and samples |
| 11 | 6.1.7 Weigh bowl 6.1.8 Volumetric flask 6.1.9 Graduated cylinder, 100 ml 6.1.10 Magnetic stirrer 6.1.11 Magnetic stir bar 6.1.12 Pipette 6.1.13 Disposable glass pipettes (e.g. Pasteur pipettes) 6.1.14 Pipette bulbs, 2 ml or greater 6.1.15 Sample bottle with cap (for test swatch extraction) 6.1.16 Laboratory wipes 6.1.17 Distilled water |
| 12 | 6.1.18 Squirt bottle 6.1.19 Funnel 6.1.20 Reference detergent A* base powder 6.2 Preparation of equipment 6.2.1 UV spectrophotometer check 6.2.2 Cleanliness 6.2.3 Cuvette filling and cleaning 6.2.4 Checking the quality of the distilled water 6.2.4.1 General |
| 13 | 6.2.4.2 Spectrum from 200 nm to 350 nm |
| 14 | 6.2.4.3 Calculation of net absorbance (223 nm – 330 nm) 6.2.4.4 Calculation of relative peak absorbance |
| 15 | 6.2.5 Cuvette matching 6.3 Procedure 6.3.1 Detergent concentration curve 6.3.1.1 General |
| 16 | 6.3.1.2 Frequency for Determining Detergent Concentration Curve 6.3.1.3 Procedure for Determining Detergent Concentration Curve 6.3.2 Test run procedure 6.3.2.1 Prepare the load for performance test according to IEC / EN 6.3.2.2 Perform the test run as specified in Clause 8 of EN 60456:2016 with the following changes 6.3.3 Acquiring samples |
| 17 | 6.3.4 UV Absorbance Measurements 6.3.4.1 Preparation of Equipment 6.3.4.2 Preparation of Blank 6.3.4.3 Preparation and reading of Specimens from Extracted Water Samples |
| 18 | 6.4 Expression of results 6.4.1 Rinsing Effectiveness |
| 20 | 6.4.2 Rinse Evenness 7 Data to be reported |
| 21 | Annex A (normative)Procedure for Determining Detergent Concentration Curve A.1 General approach A.2 IEC-A* base detergent sampling A.3 Distilled Water A.4 Preparation of Stock 1 solution (IEC-A* base powder detergent) A.4.1 Sample Weighing A.4.2 Mix the Sample |
| 22 | A.4.3 Stock 1 Calculation A.5 Preparation of Stock 2 A.5.1 Mix the Sample A.5.2 Stock 2 Calculation |
| 23 | A.6 Preparation of Working Standards A.6.1 Mix the Solutions A.6.2 Working Standard Calculations |
| 24 | A.7 Measure the Absorbance of the Working Standard Solutions |
| 25 | A.8 Calculations A.8.1 Initial Treatment of the Data A.8.2 Single sample data (per detergent sample) A.8.3 Combined sample data (all detergent samples) |
| 26 | Annex B (normative)IEC-A* base powder detergent sampling B.1 Purpose B.2 Devices and Materials B.3 Sampling procedure |
| 30 | Annex C (informative)Acquiring samples using a dispenser C.1 General C.2 Calibration of the dispenser C.2.1 General C.2.2 Priming C.2.3 Setting the volume C.2.4 Calibration: |
| 31 | C.2.5 Calculation: C.3 Acquiring samples (with dispenser) |
| 32 | Annex D (informative)Quartz cuvette and glassware cleaning and handling D.1 Purpose D.2 Cuvettes D.3 General Cleaning |
| 33 | D.4 Periodic Glass Cleaning D.4.1 General D.4.2 Standard Glassware Cleaning Solutions |
| 34 | Annex E (informative)Uncertainty of the test method |
| 35 | Annex F (informative)Reduction of the test effort |
| 36 | Annex G (normative)Test report – Data to be recorded G.1 General G.2 Data for test washing machine |
| 37 | G.3 Data, parameters and results for the test series |
| 38 | G.4 Example of calibration data collection (including calculation) |
| 40 | G.5 Example of data collection for measurement |
