Standard No.:	GB 3143-1982
English Name:	Color determination method of liquid chemicals(Hazen unit;Platinum-cobalt scale)
Chinese Name:	液体化学产品颜色测定法(Hazen单位-铂-钴色号)
Chinese Classification:	G04    Basic standards and general methods
Professional Classification:	GB    National Standard
ICS Classification:	71.040.40 71.040.40    Chemical analysis 71.040.40
Issued by:	NBS
Issued on:	1982-7-2
Implemented on:	1983-3-1
Status:	valid
Language:	English
File Format:	PDF
Word Count:	1000 words
Price(USD):	30.0
Delivery:	via email in 1 business day

1 Method summary The color of the sample is visually compared with that of the standard platinum-cobalt colorimetric solution, and the result is expressed in Hazen (platinum-cobalt) color unit. Hazen (platinum-cobalt) color unit is the color of solution containing 1mg of platinum (in chloroplatinic acid) and 2mg of cobalt chloride hexahydrate per liter. 2 Apparatus 2.1 Type 72 spectrophotometer or similar spectrophotometer. 2.2 Nessler tube: 50mL or 100mL with scale mark at 100mm above the bottom. 2.3 Colorimetric tube rack: generally, the bottom of the colorimetric tube rack is lined with a white base plate, and a reflector can be installed at the bottom to improve the color observation effect. 3 Reagent 3.1 Cobalt chloride hexahydrate (CoCl2•6H2O): analytical reagent. 3.2 Hydrochloric acid: analytical reagent, complying with GB 622 Hydrochloric acid. 3.3 Chloroplatinic acid (H2PtCl6): Preparation method of chloroplatinic acid: dissolve 1.00g of platinum in sufficient aqua regia by heating in a boiling water bath in a glass dish or a porcelain dish; after the platinum is dissolved, evaporate the solution to dryness; add 4mL of hydrochloric acid solution and evaporate the solution to dryness; repeat the operation for more than two times and 2.10g of chloroplatinic acid can be obtained. 3.4 Potassium chloroplatinate (K2PtCl6): analytical reagent.

1 Method summary 2 Apparatus 3 Reagent 4 Preparation 5 Test procedure 6 Result report Additional explanation