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Sample pretreating method for metal content analysis

A sample pretreatment and metal technology, which is applied in the preparation of test samples, etc., can solve the problems of long oxidation process, serious environmental pollution, and large safety hazards, and achieve shortened pretreatment time, safe operation, and low environmental pollution. Effect

Inactive Publication Date: 2006-03-08
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology

In the process of using the combustion ashing / high temperature furnace oxidation method to process samples, due to the use of open flame combustion for ashing, the environmental pollution during the operation is serious, the safety hazard is large, and the amount of ash produced is large, resulting in the subsequent oxidation process. more time

Method used

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  • Sample pretreating method for metal content analysis

Examples

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Effect test

example 1

[0026] Weigh a certain amount of oil sample and place it in a quartz beaker, put the beaker into figure 1shown in the sample processing apparatus. Nitrogen gas was introduced into the heating furnace 4 from the gas inlet 1 at a flow rate of 2 liters / minute, and at the same time, the temperature of the heating furnace was raised to 600° C. at a temperature increase rate of 10° C. / minute. During the temperature program heating process, the volatile matter in the beaker is evaporated in order of boiling point from low to high, and turns into oil vapor, and is carried by nitrogen into the oil and gas outlet pipe 7, and condenses after exchanging heat with cold imported nitrogen. , flows into the waste oil bottle 3 along the pipe wall, and the nitrogen gas is discharged from the heating furnace through the gas outlet 2, and the non-volatile metal compounds and the generated coke-like substances remain in the beaker. After the furnace temperature rises to 600°C, continue to flow ni...

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Abstract

A sample pretreatment method for metal content analyzing, which contains heating the oil sample in inert gas to 450-700 degree centigrade to evaporate the volatile matter and remain metal element in residue, oxidizing the residue to convert metal element into metal oxide, added with inorganic acid to dissolve oxide and prepare into aqueous solution of sample. Said invention can be used in oil sample pretreatment of emission spectrum, atom absorption spectrum and color matching etc test.

Description

technical field [0001] The invention is a pretreatment method for sample analysis, in particular, a sample pretreatment method for metal content analysis. Background technique [0002] In petroleum processing technology, especially in heavy oil processing technology, the level of metal content in raw materials has a great influence on the process and catalyst. Therefore, accurate and rapid determination of metal content in crude oil and various distillates is very important for the petroleum and petrochemical industry. is of great significance. The commonly used methods for the determination of metal content in oil and additive samples are plasma emission spectrometry (ICP / AES) and atomic absorption spectrometry (AAS). During the measurement, the sample needs to be pretreated so that the metal elements in it are converted into metal oxides, and then the oxides are dissolved with acid and prepared into an aqueous solution before the measurement can be carried out. The commo...

Claims

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Application Information

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IPC IPC(8): G01N1/28
Inventor 杨德凤范登利蔺玉贵
Owner CHINA PETROLEUM & CHEM CORP
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