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A method for detecting volatile disinfection by-products in water using solid-phase microextraction-gas chromatography-mass spectrometry

A technology of disinfection by-products and gas chromatography, which is used in measuring devices, instruments, scientific instruments, etc., can solve the problems of low detection sensitivity, high temperature resistance and instability.

Inactive Publication Date: 2020-10-23
SHANDONG ANALYSIS & TEST CENT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Its detection sensitivity is low, and it has poor selectivity to target compounds, is not resistant to high temperature, and is unstable

Method used

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  • A method for detecting volatile disinfection by-products in water using solid-phase microextraction-gas chromatography-mass spectrometry
  • A method for detecting volatile disinfection by-products in water using solid-phase microextraction-gas chromatography-mass spectrometry
  • A method for detecting volatile disinfection by-products in water using solid-phase microextraction-gas chromatography-mass spectrometry

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Embodiment 1 takes MIL-96 as the preparation of the solid-phase microextraction probe of coating material

[0033] (1) Metal material MIL-96 was prepared by referring to existing literature: accurately weigh 2.088g of aluminum nitrate nonahydrate and 0.409g of trimesic acid, mix them in 30mL of deionized water, and stir at room temperature until completely dissolved. Then the mixture was transferred to a 100 mL polytetrafluoroethylene-lined stainless steel reactor and placed in an oven at 200 °C for 24 h. Finally, the reaction solution was washed at least 3 times with absolute ethanol and deionized water, and dried in an oven at 60°C for 24 hours; figure 1 shown)

[0034] (2) The metal-organic material MIL-96 obtained through step (1) is adhered to the probe as a probe coating to obtain a solid-phase microextraction probe; (the MIL-96 electron microscope picture assembled on the probe like figure 2 shown)

[0035] (3) Perform aging treatment on the solid-phase microe...

Embodiment 2

[0036] The establishment of embodiment 2 methodology

[0037] (1) Adsorption treatment is carried out by using the aged probe in step (3), the adsorption conditions are: extraction temperature 25°C; extraction time 30min; stirring rate 300rpm; pH=6.0; salinity 30%;

[0038] (2) The probe adsorbed in step (1) is directly desorbed by gas chromatography-mass spectrometry: the desorption time is 5 min; the desorption temperature is 200°C. The detection conditions are: chromatographic column: DB-624MS (30m×0.25mm×1.4μm); heating program: initial temperature of 50°C, keep for 3min, raise the temperature to 200°C at a speed of 20°C / min, keep for 2min; The speed of / min was increased to 280°C and kept for 1min; carrier gas: helium, flow rate: 1.0ml / min; mass spectrometer selected EI as ion source, and adopted SIM mode. (trihalomethane and trichloropicrin solid-phase microextraction chromatograms are as image 3 shown)

Embodiment 3

[0039] Example 3 Methodological Results

[0040] Using MIL-96 as the probe material, a new method for the complete detection of trihalomethanes and trichloropicrins was established through subsequent gas chromatography-mass spectrometry. The established method has a wide linear range of 0.02-50 μg / L, a detection limit of 0.0030-0.0110 μg / L, and a quantification limit of 0.0090-0.0332 μg / L, which is superior to traditional pretreatment methods (see Table 1). The above data show that the method has good precision, stability and reproducibility, and can be used for the accurate determination of volatile disinfection by-products trihalomethanes and trichloropicrin in water.

[0041] Table 1 MIL-96 is the methodology result of coating material

[0042]

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Abstract

The invention discloses a method for detecting volatile disinfection by-products including trihalomethane and trichloronitromethane in drinking water or sewage by a solid phase microextraction-gas chromatography-mass spectrometry technique. A metal organic framework material MIL-96 is used as a coating material of a solid-phase microextraction probe for the first time and applied to pretreatment of the volatile disinfection by-products to establish a complete novel trihalomethane and trichloronitromethane analytic detection method along with gas chromatography-mass spectrometry. The MIL-96 coating material is high in adsorption capacity and heat resistance and higher than commercial coatings in extraction power and enables recycling of aged probes. The method is 0.02-50microgram / L in linear detection range, 0.0030-0.0110microgram / L in detection limit and 81.0%-109.9% in standard recovery rate, has advantages of high sensitivity, simplicity, quickness, high repeatability and the like and is suitable for popularization and application.

Description

technical field [0001] The invention belongs to the field of environmental detection, and more specifically relates to a method for detecting volatile disinfection by-products trihalomethanes and trichloropicrins in water by using solid-phase microextraction-gas chromatography-mass spectrometry technology. Background technique [0002] As an inevitable product in the disinfection process of drinking water and reused sewage, disinfection by-products will pose potential health risks to humans and organisms in receiving water due to their teratogenic, carcinogenic, and mutagenic effects. Disinfection by-products can be divided into two categories: volatile and non-volatile, and most of the currently known disinfection by-products are volatile. Among the many types of volatile disinfection by-products, trihalomethanes and halonitromethanes are the two most important types. Trihalomethanes are the earliest detected volatile disinfection by-products with the highest content. my c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N30/02G01N30/06
CPCG01N30/02G01N30/06G01N2030/062
Inventor 张贝贝赵汝松徐桂菊李磊王霞王晓利李娜
Owner SHANDONG ANALYSIS & TEST CENT
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