Leaching toxicity test for monitoring methods for harmful characteristics of solid waste
Solid waste is washed and soaked by water, and harmful components will be transferred to the water phase to contaminate surface water and groundwater, causing secondary pollution.
Leaching toxicity test The aqueous solution was leached by a prescribed method, and then the leachate was analyzed. The analytical projects specified in China include mercury, cadmium, arsenic, chromium, arsenic, chromium, copper, zinc, nickel, strontium, barium, fluoride, cyanide, sulfide, and nitrobenzene.
The leaching method is as follows:
Weigh 100g (dry basis) sample (samples that cannot be weighed dry weight are first measured for moisture content), placed in a wide-mouth polyethylene bottle with a volume of 2L (Φ 130mm × 160mm ), add 1L of water (1L ( First adjust the pH to 5.8~6.3 with sodium hydroxide solution or hydrochloric acid solution.
The wide-mouth polyethylene bottle was vertically fixed on a reciprocating horizontal oscillator, and the oscillation frequency was adjusted to ( 100 ± 10 ) times /min , the amplitude was 40 mm , and the mixture was shaken at room temperature for 8 hours and allowed to stand for 16 hours .
The leachate was filtered through a 0.45 um filter. The filtrate is protected according to the requirements of an analytical project and stored under suitable conditions. Two parallel leaching toxicity tests were performed for each sample. Each bottle of the filtrate was measured twice in parallel for the item to be tested, and the arithmetic mean value was reported. For the aqueous sludge sample, the filtrate must also be analyzed and the results reported; It should also include the name, source, collection time, sample size gradation of the sample to be tested, abnormal conditions during the test, pH , color, emulsification and phase stratification of the leachate, ambient temperature and fluctuation range of the test process. , conditions change and its causes.
In view of the compatibility of the sample with the leaching container, in some cases, a glass bottle of similar shape and volume can be used in place of the polyethylene bottle. For example, it is preferable to use a hard glass container for the determination of the organic component. For some special types of solid waste, due to safety and sample collection, if the test cannot be carried out strictly according to the above conditions, it may be changed according to the actual situation. The leachate analysis project is carried out in accordance with the relevant standards and the corresponding analytical methods.
Prepared by Yingnuo Instruments
For more information please pay attention to http://
Solid waste is washed and soaked by water, and harmful components will be transferred to the water phase to contaminate surface water and groundwater, causing secondary pollution.
Leaching toxicity test The aqueous solution was leached by a prescribed method, and then the leachate was analyzed. The analytical projects specified in China include mercury, cadmium, arsenic, chromium, arsenic, chromium, copper, zinc, nickel, strontium, barium, fluoride, cyanide, sulfide, and nitrobenzene.
The leaching method is as follows:
Weigh 100g (dry basis) sample (samples that cannot be weighed dry weight are first measured for moisture content), placed in a wide-mouth polyethylene bottle with a volume of 2L (Φ 130mm × 160mm ), add 1L of water (1L ( First adjust the pH to 5.8~6.3 with sodium hydroxide solution or hydrochloric acid solution.
The wide-mouth polyethylene bottle was vertically fixed on a reciprocating horizontal oscillator, and the oscillation frequency was adjusted to ( 100 ± 10 ) times /min , the amplitude was 40 mm , and the mixture was shaken at room temperature for 8 hours and allowed to stand for 16 hours .
The leachate was filtered through a 0.45 um filter. The filtrate is protected according to the requirements of an analytical project and stored under suitable conditions. Two parallel leaching toxicity tests were performed for each sample. Each bottle of the filtrate was measured twice in parallel for the item to be tested, and the arithmetic mean value was reported. For the aqueous sludge sample, the filtrate must also be analyzed and the results reported; It should also include the name, source, collection time, sample size gradation of the sample to be tested, abnormal conditions during the test, pH , color, emulsification and phase stratification of the leachate, ambient temperature and fluctuation range of the test process. , conditions change and its causes.
In view of the compatibility of the sample with the leaching container, in some cases, a glass bottle of similar shape and volume can be used in place of the polyethylene bottle. For example, it is preferable to use a hard glass container for the determination of the organic component. For some special types of solid waste, due to safety and sample collection, if the test cannot be carried out strictly according to the above conditions, it may be changed according to the actual situation. The leachate analysis project is carried out in accordance with the relevant standards and the corresponding analytical methods.
Prepared by Yingnuo Instruments
For more information please pay attention to http://
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