Method and system for digesting heavy metal in solid wastes with high organic matter content

A technology for solid waste and heavy metals, applied in the field of heavy metal detection, can solve the problems of failure of digestion and easy occurrence of liquid splash, and achieve the effect of complete digestion, avoiding low detection data and avoiding liquid splash.

Pending Publication Date: 2021-12-10
SHANDONG ACAD OF ENVIRONMENTAL SCI CO LTD +1
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0003] In view of the above problems, the present invention proposes a method and system for digestion of heavy metals in solid waste with high organic content, which can overcome the problem that solid waste with high organic content is prone to gas expansion during the metal digestion process, resulting in digestion failure or liquid splashing problem, the process is safer and the resolution is more complete

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  • Method and system for digesting heavy metal in solid wastes with high organic matter content

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Embodiment 1

[0024] A method for digestion of heavy metals in solid waste with high organic content, comprising the following steps: weighing 0.5 g (accurate to 0.0001 g) of an appropriate amount of sample in a polytetrafluoroethylene digestion tank, adding hydrogen peroxide in small amounts several times, and polytetrafluoroethylene at 180 ° C. Heat the vinyl fluoride digestion tank with an open electric heating plate to remove some organic matter, until no large amount of bubbles are generated after adding hydrogen peroxide, and the adding process takes about 2 hours. Move the sample in the polytetrafluoroethylene digestion tank to the polytetrafluoroethylene microwave digestion instrument, rinse it with water for 3 times, add 10ml of nitric acid, the concentration of nitric acid is 1.42g / mL (the following examples are the same), 5ml of hydrochloric acid, the concentration of hydrochloric acid 1.19g / mL (the same in the following examples) and 10ml of hydrofluoric acid, the concentration o...

Embodiment 2

[0026] A method for digestion of heavy metals in solid waste with high organic content, comprising the following steps: weighing 1 g (accurate to 0.0001 g) of an appropriate amount of sample in a polytetrafluoroethylene digestion tank, adding hydrogen peroxide in small amounts several times, The ethylene digestion tank is heated with an open electric heating plate to remove some organic matter, until no large amount of bubbles are generated after adding hydrogen peroxide, and the addition process takes about 0.5 hours. Move the samples in the polytetrafluoroethylene digestion tank to an oven for high-pressure sealed tanks, rinse with laboratory water for 3 times, add 5ml of nitric acid, 2ml of hydrochloric acid and 2ml of hydrofluoric acid, digest at 120°C for 30min, and then at 150°C Digest at high temperature for 20 minutes, and finally digest at 200 ° C for 20 min. After the high-pressure sealed tank is cooled by oven temperature, remove the polytetrafluoroethylene digestion...

Embodiment 3

[0028] A method for digestion of heavy metals in solid waste with high organic content, comprising the following steps: weighing 1.2 g (accurate to 0.0001 g) of an appropriate amount of sample in a polytetrafluoroethylene digestion tank, adding hydrogen peroxide in small amounts several times, and polytetrafluoroethylene at 160 ° C. Heat the vinyl fluoride digestion tank with an open electric heating plate to remove some organic matter, until there is no large amount of bubbles after adding hydrogen peroxide, and the addition process takes about 1 hour. Move the sample in the polytetrafluoroethylene digestion tank to a polytetrafluoroethylene microwave digestion apparatus, wash it with laboratory water for 3 times, add 7ml of nitric acid, 3ml of hydrochloric acid and 5ml of hydrofluoric acid, digest at 120°C for 30min, and then Digest at 150°C for 20min, and finally at 200°C for 20mim. After the temperature of the PTFE microwave digestion instrument cools down, remove the PTFE ...

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Abstract

The invention provides a method and a system for digesting heavy metals in solid wastes with high organic matter content, and the method comprises the following steps: adding hydrogen peroxide into the solid wastes for heating treatment, and then digesting the heavy metals. According to the technical scheme, after hydrogen peroxide is added, organic matter interference is removed through heating, the digestion process of heavy metal in the solid waste with the high organic matter content is safer, and the problem that digestion fails or liquid splashing is likely to happen due to gas expansion is solved; and meanwhile, the digestion is more complete, and low detection data caused by incomplete understanding is avoided.

Description

technical field [0001] The invention belongs to the technical field of heavy metal detection, and in particular relates to a method and system for digesting heavy metals in solid waste with high organic content. Background technique [0002] The digestion of heavy metals is mainly aimed at oil products and solid wastes with low organic content. For example, the determination of lead, cadmium, chromium and nickel in oil products. Inductively coupled plasma mass spectrometry DB37T3936-2020 Microwave digestion method Add nitric acid hydrogen peroxide according to microwave digestion The temperature setting of the instrument is used for digestion, followed by acid removal and constant volume analysis. The determination of 22 metal elements in solid waste was carried out by inductively coupled plasma emission spectrometry HJ781-2016. In the prior art, the method for digestion of metal elements in solid waste with high organic content includes sample preparation, heating to remov...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N1/44G01N1/28
CPCG01N1/44G01N1/28
Inventor 薛洁孙慧玲刘朋刘庆郭宇张一瑾陈昭晶姚钧凡程婷婷李修彪杜丽丽董广
Owner SHANDONG ACAD OF ENVIRONMENTAL SCI CO LTD
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