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PDF GB/T 3143-1982 English
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GB/T 3143-1982
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Color determination method of liquid chemicals (Hazen unit - Platinum-cobalt scale)
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GB/T 3143-1982: PDF in English (GBT 3143-1982)
GB 3143-82 GB UDC 661.535.65 National Standard of the People’s Republic of China Color determination method of liquid chemicals (Hazen unit – platinum-cobalt scale) ISSUED ON. JULY 20, 1982 IMPLEMENTED ON. MARCH 1, 1983 Approved by. State Standardization Bureau Table of Contents 1 Method summary ... 3 2 Instruments ... 3 3 Reagents ... 3 4 Preparations ... 4 5 Test procedures ... 5 6 Result report ... 5 Additional information... 5 Color determination method of liquid chemicals (Hazen unit – platinum-cobalt scale) This Standard applies to the color determination of the clear liquid chemicals or the liquid chemicals of a color that is slightly similar to the reference platinum- cobalt scale. This color is typically characterized as “yellow brown”. 1 Method summary COMPARE the color of the sample with that of the standard platinum-cobalt color solution by visual inspection. USE Hazen (platinum-cobalt) color unit to show the results. The Hazen (platinum-cobalt) color unit indicates that. A liter of solution contains the color of 1mg of platinum (calculated as chloroplatinic acid) and 2mg of cobalt chloride hexahydrate solution. 2 Instruments 2.1 Type 72 spectrophotometer or similar ones. 2.2 Nessler tube. 50 or 100mL, graduated at 100mm above the bottom. 2.3 Colorimetric tube rack. Generally, the colorimetric tube racks are lined with white bottom plates. They can also be equipped with reflectors on the bottom, so as to improve the effects of color observation. 3 Reagents 3.1 Cobalt chloride hexahydrate (CoCl2 • 6H2O). Analytical reagent. 3.2 Hydrochloric acid. Analytical reagent, which meets the requirements of GB 622 Hydrochloric acid. 3.3 Chloroplatinic acid (H2PtCl6). Preparation method of chloroplatinic acid. PUT 1.00g of platinum on a glass or porcelain dish. HEAT the glass or porcelain dish on the boiling water bath until the platinum is dissolved in a sufficient amount of aqua regia. EVAPORATE the solution until there is nothing left. ADD 4ml of hydrochloric acid solution. EVAPORATE until there is nothing left again. REPEAT this operation more than twice, so as to obtain 2.10g of chloroplatinic acid. 4.3 Storage. Respectively PUT the standard colorimetric mother-solution and the diluted solution in the brown glass bottles with stoppers. PLACE the glass bottles in the dark. The standard colorimetric mother-solution can be kept for 1 year, while the diluted solution can be kept for 1 month. It is best to use the freshly prepared solution. 5 Test procedures 5.1 INJECT a certain amount of sample into a Nessler tube until it fills up to the scale mark. Similarly, INJECT the standard platinum-cobalt contrast solution with similar color into another Nessler tube until it fills up to the scale mark. 5.2 COMPARE the color of the sample with that of the standard platinum-cobalt contrast solution. CONDUCT color comparison under the sunlight or fluorescent light. Directly FACE the white background. OBSERVE from top to bottom. AVOID observing from the side. PICK out the similar colors. 6 Result report The sample color is represented by the Hazen (platinum-cobalt) color unit of standard platinum-cobalt contrast solution, which is the most similar to the sample color. If none of the color of standard platinum-cobalt contrast solution is consistent with that of the sample, then ESTIMATE a similar platinum-cobalt scale according to the possibilities, and DESCRIBE the observed color. Additional information. This Standard was proposed by the Ministry of Petroleum Industry of the People’s Republic of China, and shall be under the jurisdiction of SINOPEC Research Institute of Petroleum Processing. Responsible drafting organization of this Standard. Plant 7 of Dalian Petrochemical Corporation.
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Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.