Determination of heavy metals in soil by ICP-2060T

2023-03-15 04:08:14

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ICP-2060T

Determination of heavy metals in soil

Abstract: The sample is digested by heating acid to

ICP-2060T

Determination of copper, zinc, nickel, lead, cadmium, chromium. The method is applied to the determination of copper, zinc, nickel, lead, cadmium, chromium and arsenic in soil samples, and the pretreatment process is simple, the equipment is simple, and the cost is low. The experimental results show that when the method is applied to the determination of heavy metals in soil, the determination results are accurate and reliable, and the repeatability is good.

Foreword

As the main carrier of agricultural production and an important part of the ecological environment, soil quality is closely related to people's life. With the development of the economy, a large amount of untreated waste containing heavy metals is discharged into the environment, making The farmland soil environment and crops have been polluted and destroyed to varying degrees, which in turn endangers human health and even life through the food chain. Therefore, the problem of heavy metal pollution in soil has become an increasingly serious ecological problem. Analytical determination of heavy metals in soil, before sample

Processing is the key. In this paper, the hot plate heating method is used for pretreatment of soil samples.

ICP-AES

The content of copper, zinc, nickel, lead, cadmium and chromium is determined, the method is simple, safe, low cost, and the test result has high accuracy and precision.

Experimental part

2.1

Main instruments and reagents

2.1.1

instrument

ICP-2060T

Inductively coupled plasma atomic emission spectrometer, Jiangsu Tianrui Instrument Co., Ltd.;

BS224S

Electronic balance, Sartorius Scientific Instruments (Beijing) Co., Ltd.;

EPED-40T

Laboratory-grade ultra-pure water machine, Nanjing Yipu Yida Technology Development Co., Ltd.;

EG35A

Type electronic temperature control heating plate, Beijing Laibo Tyco Instrument Co., Ltd.; pipetting gun (

10-100uL

100-1000uL

) Two, Prand, Germany.

The polytetrafluoroethylene beaker and the plastic volumetric flask used are all made of nitric acid (

1+1

Soak overnight, rinse directly with ultrapure water before use, and dry naturally before use.

2.1.2

Reagent

The experimental water is ultrapure water; the experimental acid is excellent grade pure acid: hydrochloric acid, nitric acid, hydrofluoric acid, perchloric acid

Soil standards are provided by the State Environmental Protection Administration Standards Institute

Standard material: standard solution of copper, zinc, nickel, lead, cadmium, chromium (

1000mg/L

) provided by the National Nonferrous Metals Analysis and Testing Center.

2.2

experimental method

2.2.1

Preparation of sample test solution

Accurate weighing

0.2

0.3g

(accurate to

0.0001g

Sample

50mL

In a Teflon beaker, wet with water and then add

10mL

Hydrochloric acid, heated at a low temperature on a hot plate in a fume hood, causing the sample to be initially decomposed and to be evaporated to about

3 mL

When you take it, take a little cold and then join

5 mL

Nitric acid,

5 mL

Hydrofluoric acid,

3 mL

Perchloric acid, after heating, heating on a hot plate at medium temperature

After about an hour, then open the lid and continue to heat the silicon. In order to achieve a good flying silicon effect, the beaker should be shaken frequently. When heated to a thick white smoke of perchloric acid, it is capped to decompose the black organic carbide. After the black organic matter on the inner wall of the beaker disappears, the lid is opened, the white smoke is driven away, and the contents are viscous, and the content can be supplemented depending on the digestion.

3 mL

Nitric acid,

3 mL

Hydrofluoric acid,

1 mL

Perchloric acid, repeat the above digestion process. When the white smoke is exhausted again and the contents are viscous, remove the cooling, rinse the inner wall and lid with water, and add

1 mL

(

1+1

The nitric acid solution warms the residue. Then transfer the whole amount to

50 mL

In the volumetric flask, after cooling, make up to the line and shake it for testing. At least one parallel sample is guaranteed for each sample, and a blank solution is prepared by using water as a sample, and at least one sample is prepared in each batch.