Soil sampler for VOCs analysis

Abstract

The invention relates to a soil sampler for VOCs analysis. The soil sampler comprises a sampling cylinder, a sealing cover, a piston, a piston rod connected with the center of the piston, and a push rod. The piston rod is radially provided with a positioning part, the upper end of the sampling cylinder is provided with a piston limiting end cover, the center of the piston limiting end cover is provided with a through hole, and the through hole is radially provided with a positioning groove. External threads are arranged on the outer side of the upper end of the sampling cylinder, internal threads are arranged on the inner side of the upper end of the sealing cover, and the sealing cover covers the sampling cylinder from bottom to top and is connected with the external threads through the internal threads. The push rod is connected with the sampling cylinder without limiting the axial actions of the piston rod and the positioning part. Compared with a traditional sampling glass bottle,the problem of volatilization loss in the sampling and transporting process in soil VOCs analysis is solved, field operation steps are simplified, inflammable and highly corrosive chemicals do not need to be carried, and the sampling glass bottle is particularly suitable for field sampling.

Description

technical field [0001] The invention belongs to the technical field of samplers, in particular to a soil sampler used for VOCs analysis. Background technique [0002] Soil is one of the most important natural elements and the material basis for human survival. The quality of soil environment is not only directly related to the safety of agricultural products and ecological security, but also related to human health, and even related to social development and stability. Among many soil pollutants, VOCs (Volatile Organic Compounds) are common and important pollutants. For example, a compound in VOCs, methyl tert-butyl ether (MTBE for short), appears in the soil polluted by gas stations, and it is often necessary to collect soil samples for analysis during the assessment and treatment process and monitoring. On the other hand, since VOCs are important precursors that cause fine particulate matter (PM2.5) and ozone (O3) pollution, they have gradually become the focus of natio...

AI Technical Summary

Problems solved by technology

[0013] (3) The sampling glass bottle is easily broken in the field, and the seal is damaged and leaks;

[0014] (4) It is difficult to operate in windy and rainy days

At the same time, the VOCs in the soil have a dynamic balance among the three phases of the soil, that is, solid matter, soil water and soil air. If the environment of the collected soil sample destroys this balance, such as water content reduction or headspace volume increase, the content of VOCs in the soil will change, and its original concentration cannot be accurately analyzed

Images