CN103558068A - Pretreatment method for soil detection - Google Patents

Abstract

The invention relates to a pretreatment method for soil detection and belongs to the field of analytical chemistry. The method comprises the following steps: (1) removing solid impurities from a soil sample, and grinding, drying and grinding the soil sample in sequence; (2) adding concentrated nitric acid and hydrogen peroxide into the sample which is obtained in the step (1) for digestion, wherein in a digestion temperature-raising program, the temperature is raised from a room temperature to 120 DEG C and keeps constant for 5 minutes, the temperature is raised from 120 DEG C to 200 DEG C and keeps constant for 15 minutes, the temperature is raised from 200 DEG C to 300 DEG C and keeps constant for 10 minutes, and the temperature-raising speed rate is 60 DEG C/min; and (3) cooling the sample which is digested in the step (2) to the room temperature. The pretreatment method has the beneficial effect that the application range of wet digestion is widened through the digestion temperature-raising program.

Description

The pre-treating method that a kind of soil detects

Technical field

The present invention relates to the pre-treating method that a kind of soil detects, belong to analytical chemistry field.

Background technology

In the process of analytical chemistry development, Sample pretreatment technology never comes into one's own, relatively and the fast development of modern analytical technique, the development of Sample pretreatment technology and instrument lags behind and has restricted the development of analytical chemistry, in in the past a lot of years, the development of analytical chemistry concentrates on of the method for researching and analysing itself: how to improve sensitivity, selectivity and analysis speed; How the theory of the aspect such as applied physics, chemistry, biology develops new analytical approach and technology, the fresh target and the high request that analytical chemistry are proposed to meet new technology; The achievement of how to employ new technology is improved the degree of performance, speed and the robotization of analytical instrument.Ignoring for a long time the research to pre-treating method and technology, is the bottleneck that Sample pretreatment technology becomes the development of restriction analytical chemistry.

The complexity of the sample properties that Modern Analytical Chemistry faces is unprecedented, and the object of analysis not only comprises all substances during gas, liquid, solid mutually, and often with heterogeneous form, exists; It forms not only complicated, and the time often phase mutual interference of measuring; The concentration requirement of detected material is more and more lower simultaneously, stability changes at any time, thereby brought a series of difficulties to analysis, the possibility of directly carrying out after especially various environment and biological specimen collection is very little, generally all will after sample preparation and pre-treatment, could measure.

Summary of the invention

The present invention has expanded the applicability of Wet by temperature programme.

The invention provides the pre-treating method that a kind of soil detects, described method comprises the steps:

1. pedotheque is removed to solid impurity, pulverizing, dry, pulverizing;

2. by step 1. gained sample add red fuming nitric acid (RFNA), hydrogen peroxide to clear up, described in to clear up heating schedule as follows:

Room temperature is warming up to 120 ℃ of constant temperature 5min, and 120 ℃ are warming up to 200 ℃ of constant temperature 15min, and 200 ℃ are warming up to 300 ℃ of constant temperature 10min, and heating rate is 60 ℃/min;

3. 2. step is cleared up to rear sample and be cooled to room temperature.

Beneficial effect of the present invention is:

1. adopt temperature programme to expand the scope of application of Wet;

2. temperature programme can destroy most organism and reducing substances, improves accuracy in detection.

Embodiment

Following non-limiting example can make the present invention of those of ordinary skill in the art's comprehend, but does not limit the present invention in any way.

Embodiment 1

The pre-treating method that soil detects, described method comprises the steps:

1. pedotheque is removed to solid impurity, pulverizing, dry, pulverizing;

2. by step 1. gained sample add red fuming nitric acid (RFNA), hydrogen peroxide to clear up, described in to clear up heating schedule as follows:

Room temperature is warming up to 120 ℃ of constant temperature 5min, and 120 ℃ are warming up to 200 ℃ of constant temperature 15min, and 200 ℃ are warming up to 300 ℃ of constant temperature 10min, and heating rate is 60 ℃/min;

3. 2. step is cleared up to rear sample and be cooled to room temperature.

Claims (1)

1. the pre-treating method that soil detects, described method comprises the steps:

1. pedotheque is removed to solid impurity, pulverizing, dry, pulverizing;

2. by step 1. gained sample add red fuming nitric acid (RFNA), hydrogen peroxide to clear up, described in to clear up heating schedule as follows:

Room temperature is warming up to 120 ℃ of constant temperature 5min, and 120 ℃ are warming up to 200 ℃ of constant temperature 15min, and 200 ℃ are warming up to 300 ℃ of constant temperature 10min, and heating rate is 60 ℃/min;

3. 2. step is cleared up to rear sample and be cooled to room temperature.