Method for determining dimethyl trisulfide in sediments
A technology of dimethyl trisulfide and determination method, which is applied in the direction of measuring devices, instruments, scientific instruments, etc., to meet the detection needs, optimize the extraction temperature, and be environmentally friendly
Pending Publication Date: 2020-12-01
苏州见远检测技术有限公司
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[0002] Dimethyl trisulfide is an odor-causing substance in water bodies. For example, in the 2007 Wuxi Taihu Lake water pollution incident, the culprit was sulfide substances mainly composed of dimethyl trisulfide. Some researchers found that dimethyl trisulfide Trisulfide is one of the main sources of sewer odor, and the sediments closely connected with water must also contain such substances. At present, the determination of dimethyl trisulfide in water has been reported in the literature, but the determination of dimethyl trisulfide in sediments Methyl trisulfide has not been reported, therefore, it is necessary to establish a method for determining dimethyl trisulfide in sediment
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[0019] In order to make the technical solution of the present invention clearer, the present invention will be further described below in conjunction with specific embodiments of the accompanying drawings.
[0020] Such as Figure 1-3 Shown, the assay method of dimethyl trisulfide in a kind of sediment according to the embodiment of the present invention is characterized in that: comprises the steps:
[0021] A: Sampling, take a portion of about 2g of sediment into a 20ml headspace sample bottle, then add 3.0g of sodium chloride, screw on the bottle cap, and wait for testing; another portion (about 2g) is used to determine the water content of the sample Determination;
[0022] B: Headspace solid-phase microextraction, choose 75μm CAR / PDMS extraction head; extraction conditions: heating temperature 50°C; extraction time 30min; depth of extraction head inserted into the bottle 25mm; analysis time 5min; heater speed 500rpm;
[0023] C: GC-MS analysis. After the headspace solid...
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The invention aims to overcome the defects of the existing sample determination technology, and particularly relates to a method for determining dimethyl trisulfide in sediments, which comprises the following steps of sampling, headspace solid-phase microextraction and GC-MS analysis. According to the method, the extraction effects of different types of extraction fibers are compared; the method optimizes extraction conditions such as extraction temperature, extraction time, salt effect and the like, establishes a new method for determining dimethyl trisulfide in sediments by headspace solid-phase microextraction / gas chromatography / mass spectrometry, has the characteristics of sensitivity, rapidness, environmental friendliness and the like, can accurately quantify odor substances in sediments, and meets the detection requirements of actual samples.
Description
technical field [0001] The invention relates to a method for determining chemical substances, in particular to a method for determining geosmin and 2-methylisoborneol in sediments. Background technique [0002] Dimethyl trisulfide is an odor-causing substance in water bodies. For example, in the 2007 Wuxi Taihu Lake water pollution incident, the culprit was sulfide substances mainly composed of dimethyl trisulfide. Some researchers found that dimethyl trisulfide Trisulfide is one of the main sources of sewer odor, and the sediments closely connected with water must also contain such substances. At present, the determination of dimethyl trisulfide in water has been reported in the literature, but the determination of dimethyl trisulfide in sediments Methyl trisulfide has not been reported. Therefore, it is necessary to establish a method for the determination of dimethyl trisulfide in sediments. Contents of the invention [0003] In order to solve the above problems, the p...
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IPC IPC(8): G01N30/02G01N30/06
CPCG01N30/02G01N30/06G01N2030/062
Inventor 张泾凯顾雪华鄢姝恺
Owner 苏州见远检测技术有限公司