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With the development of industrialization, volatile organic compounds (VOCs) widely exist in the soil around the city, which poses a great threat to public health and the environment. Leakage of various storage tanks, improper treatment of organic waste solvents in chemical plants, and sewage discharge from pharmaceutical plants and electronic components plants may directly lead to soil contamination by volatile organic compounds. At the same time, the migration of volatile organic compounds in air, groundwater and wastewater also pollutes the soil. Organic pollutants can directly damage the normal function of the soil and can endanger human health through the absorption of pollutants by the plants and the accumulation of pollutants in food chains. The effects of organic pollutants on the metabolism and genetic characteristics of soil animals and on the growth and development of plants destroy the ecological environment and indirectly endanger human health. In addition, organic pollutants can be directly ingested by the human body, and may even accumulate in the body, affecting the biochemical and physiological responses of the human body, thereby affecting human metabolism, development and reproductive functions, and may also affecting the level of human mental development, destroying the nervous system and endocrine system. Common volatile organic pollutants that are harmful to human health include volatile halogenated hydrocarbons, benzene series, chlorobenzene and so on. Therefore, the detection of volatile organic compounds in soil plays an important role in the prevention and control of pollution.
As a leading global volatile organic compounds (VOCs) analysis company, Alfa Chemistry provides incredible services and credible results. Alfa Chemistry is your one-stop laboratory for the analysis of volatile organic compounds in soil.
VOCs in the soil that Alfa Chemistry can detect include:
Methods used by Alfa Chemistry to analyze VOCs include:
A portion of the extract is transferred to a headspace vial containing water.
The vial is then sealed and heated to a pre-determined temperature for a given period of time. After equilibration, a portion of the headspace above the sample is introduced into a GC/MS. The sample may be focused onto a solid sorbent trap prior to being desorbed onto the GC column. The headspace method features easy operation and good repeatability, which allows the use of an autosampler and produces little carryover (contamination of analysis instrument by high-concentration substances).
Purge & Trap Method
A portion of the extract is transferred to a vial containing water. The VOCs are purged from the sample with an inert gas, and are trapped on a solid sorbent trap. The trap is heated and the VOCs are directly introduced into a gas chromatograph equipped with a mass spectrometric detector (GC/MS). The purge & trap method uses trapping agents to concentrate the sample, and is able to measure low-concentration samples with a sensitivity 10 to 100 times higher than the headspace method.
A portion of the extract is transferred to an autosampler vial and injected into a GC inlet (typically a split/splitless or on-column inlet) for direct analysis by GC/MS.