Pretreatment method for determining of heavy metal in soil

A heavy metal and soil technology, applied in the direction of measuring devices, test sample preparation, sampling, etc., can solve the problems of incomplete digestion, time-consuming and laborious, etc., and achieve the effect of improving the digestion speed

Inactive Publication Date: 2016-04-06
SHANGHAI BRAVO TESTING TECH CO LTD
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  • Application Information

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Problems solved by technology

Wet digestion is time-consuming and laborious. The same sample needs to be digested repeatedly. M

Method used

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Embodiment

[0015] Accurately weigh 0.2-0.5g sample in the digestion tank, the sample mass is accurate to 0.0002g, add 8ml aqua regia for digestion. The digestion program is 1200W ramp time of 4 minutes to 100°C, hold for 3 minutes; 1200W ramp time of 5 minutes to 150°C, hold for 5 minutes; 1200W ramp time of 5 minutes to 180°C, hold for 25 minutes, standby.

[0016] Transfer the above-mentioned digested sample to a 50ml polytetrafluoroethylene crucible; add 5ml nitric acid, 5ml hydrofluoric acid, 3ml perchloric acid After adding the cover, heat it on the electric heating plate at medium temperature for about 1 hour, then open the cover. The temperature of the electric heating plate is controlled at 150-200°C. If the temperature is too high, some metal may be lost. Continue to heat to remove silicon. In order to achieve a good flying silicon effect, it should be Shake the crucible frequently. When heated to thick perchloric acid white smoke or about 1ml of the solution remains, remove th...

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Abstract

The invention discloses a pretreatment method for determining of heavy metal in soil. The pretreatment method includes the following steps that S1, 0.2-0.5 g of a sample is accurately weighed inside a digestion tank, and 8 ml of aqua regia is added for digestion; S2, according to the digestion process, temperature reaches 100 DEG C through 4 minutes of climbing at 1200 W to be kept for 3 minutes; temperature reaches 150 DEG C through 5 minutes of climbing at 1200 W to be kept for 5 minutes; temperature reaches 180 DEG C through 5 minutes of climbing at 1200 W to be kept for 25 minutes; S3, the digested sample obtained through S2 is transferred into a teflon crucible of 50 ml, 5 ml of nitric acid, 5 ml of hydrofluoric acid and 3ml of perchloric acid are added, a cover covers the teflon crucible, then the teflon crucible is placed on an electric hot plate to be heated for about 1 h at medium temperature, and finally the cover is opened; the temperature of the electric hot plate is controlled to be 150 DEG C-200 DEG C, heating is performed continuously to remove silicon, and when thick perchloric acid smoke or about 1 ml of solution remains through heating, the crucible is taken down to be slightly cooled; S4, after S3 is completed, 1 ml of hydrochloric acid is added, soluble residues are dissolved through warming, the total quantity of solution is transferred into a volumetric flask of 50 ml, the volume is metered to a marked line with water after cooling, and even shaking is performed. The pretreatment method has the advantages that the soil sample can be digested completely, and digestion speed can be increased.

Description

technical field [0001] The invention relates to the technical field of environmental monitoring, in particular to a pretreatment method for the determination of heavy metals in soil. Background technique [0002] In the process of determining and analyzing soil heavy metal content by atomic absorption spectrometry, sample pretreatment is the key. There are many pretreatment methods for soil samples, such as wet digestion, microwave digestion and so on. Each of these methods has advantages and disadvantages. Wet digestion is time-consuming and laborious. The same sample needs to be digested repeatedly. Microwave digestion is fast and automatically controlled, but the digestion is often not complete. [0003] So the prior art needs to be improved and developed. Contents of the invention [0004] The technical problem to be solved by the present invention is to provide a pretreatment method for the determination of heavy metals in soil, which can completely digest soil sam...

Claims

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Application Information

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IPC IPC(8): G01N1/40
CPCG01N1/4044
Inventor 宛雁杨淑兰胡海鹰温博伦夏威李牧玮薛健鲁超
Owner SHANGHAI BRAVO TESTING TECH CO LTD
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