GB/T 5087-1985 Standard for Corrosivity Test Methods for Solid Wastes from Nonferrous Metal Industries

GB/T 5087-1985 Standard for Corrosivity Test of Solid Waste from Nonferrous Metal Industries GB/T5087-1985 Standard download and decompression password: www.bzxz.net

National Standard of the People's Republic of China
Test method standard for corrasivityof solid waste Inaonferrous netal industryThis standard is specially formulated to identify the corrosiveness of solid waste in nonferrous metal industry. 1 Collection and preparation of sampleswwW.bzxz.Net
1.1 Sampling
UDC 628.191: 699
2/.8-543.06
GB 5087—~5
The collection of samples shall be carried out in accordance with GB 5086--85 "Standard for the toxicity test method of solid waste in nonferrous metal industry" 1.1. 1.2 Preparation of samples
Powder, granular and block materials shall be dried under natural conditions to a moisture content of less than 5%. When the sample size is less than 2mm, take the original sample, mix it evenly, and use the fractionation method to reduce it, and bottle it for later use. When the sample size is larger than 2mm, sieve it with a 2mm sieve. The sieve material is crushed and sieved until all pass through, mixed and reduced, and bottled for later use. When the sample is in a block larger than 2mm, it is crushed and sieved until all pass through the 2mm sieve hole, mixed and reduced, and bottled for later use. Mud or slurry materials should be fully mixed and then divided into glass or plastic containers for later use. 2 Moisture determination
Take 20g of the sample, dry it at 105℃, weigh it to a constant weight until the weight difference is less than 1mg, and calculate the water content. 3 Instruments and main materials
PH meter (minimum indication value is below 0.1pH unit) and its matching electrode. 3.2 Mixing container
Φ130×150, 2L, polyethylene bottle with cover or other glass bottles of similar shape. 3.8 Oscillator
Reciprocating horizontal oscillator, amplitude 40mm. Distilled water
Fresh distilled water, pH value 6.7~7.0.
3.5Others
Standard solutions if applicable.
4 Determination method
4.1 Use a glass electrode to determine the pH value. Before each determination, the pH meter should be calibrated with a corresponding standard solution and temperature compensation should be provided. 4.2 For materials with a high water content and a fluid state, such as thin pulp and slurry, the electrode can be directly inserted for measurement, or the pH value of the clear liquid can be measured after centrifugation or filtration.
4.a For granular materials, take 50g (ten bases) of the sample prepared in 1.2 above, put it into a mixing container, add 250ml of fresh distilled water to make the solid-liquid ratio 1:5, cover it and fix it on an oscillator, with an oscillation frequency of 120+5 times/min, an amplitude of 40mm, and an oscillation time of 30min. After the oscillation is completed, let it stand for 30min and measure the pH value of the supernatant. 4.1 For viscous sludge or other materials with high water content but non-fluid state, centrifugation or filtration can be used to separate the liquid contained in it for pH measurement. If a sufficient amount of measuring liquid cannot be separated, prepare the measuring liquid according to the procedure specified in 4.3. 4.5 When measuring, rinse the calibrated pH meter electrode with water for 3 to 6 times, then insert the electrode into the measuring solution, rotate the measuring plate for 1 minute, read the pH value, and keep the reading stable for at least 30 seconds. 4.6 When the pH value is greater than 9, in order to eliminate the "sodium difference", a low sodium difference electrode can be used, or a standard solution with a pH value close to that of the solution being tested can be selected to calibrate the instrument repeatedly. 5 Data processing and reporting
5.1 Each sample shall be tested at least three times in parallel, and the standard deviation shall not exceed ±0.15 pH1 unit. The test results shall be reported as the arithmetic mean. For measurements above pH values ​​(above 9), a standard deviation of ±0.2 pH units is allowed. When the standard deviation exceeds the specified range, the reasons must be analyzed and reported. Additional notes
This standard was proposed by the former State Council Environmental Protection Leading Group. This standard was drafted by the "Nonferrous Metals Industry Solid Waste Pollution Control Standard" Compilation Group of China Nonferrous Metals Industry Corporation. The main drafters of this standard are Wang Ren, Li Shaoshi, Shui Zhiliang, Pan Shunyi, and Fan Jizhong. This standard is entrusted to the State Environmental Protection Administration for interpretation. 512
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