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Detecting method for cyclic methyl siloxane in surface water

A technology of methyl siloxane and detection method, which is applied in the direction of measuring devices, instruments, scientific instruments, etc., and can solve the problems of inaccurate qualitative and quantitative, long detection time, etc.

Inactive Publication Date: 2016-01-20
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The purpose of the present invention is to solve the problem that the existing method for detecting methyl siloxane has a long detection time and cannot be accurately qualitative and quantitative when there are impurities, and provides a detection method for cyclic methyl siloxane in surface water. method

Method used

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  • Detecting method for cyclic methyl siloxane in surface water
  • Detecting method for cyclic methyl siloxane in surface water
  • Detecting method for cyclic methyl siloxane in surface water

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specific Embodiment approach 1

[0020] Specific embodiment one: the detection method of a kind of surface water cyclic methyl siloxane of the present embodiment is carried out according to the following steps:

[0021] 1. The sample to be tested is pretreated by liquid-liquid extraction: ①The sample to be tested is extracted with dichloromethane as the extraction liquid for the first time, shaken during extraction, and statically stratified to obtain the first organic phase and the first residual phase; The volume ratio of the extraction solution described in step ① to the sample to be tested is 1:10; ② use the extraction solution dichloromethane to perform a second extraction on the first remaining phase obtained in step ①, shake during the extraction, and statically separate , obtain the second organic phase and the second remaining phase; Step 1. The volume ratio of the extract described in the step 2 and the extract described in the step is 2:1; 3. Use the extract dichloromethane to step 2. The first obta...

specific Embodiment approach 2

[0025] Specific embodiment 2: The difference between this embodiment and specific embodiment 1 is that in step 1, the temperature of the water bath is set at 28° C. when using a rotary evaporator to concentrate the organic phase added with isooctane. Other steps and parameters are the same as those in the first embodiment.

specific Embodiment approach 3

[0026] Embodiment 3: This embodiment differs from Embodiment 1 or Embodiment 2 in that: in step 1, nitrogen gas with a purity of 99.99% is used when the concentrated sample is concentrated using a nitrogen blower. Other steps and parameters are the same as those in Embodiment 1 or 2.

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Abstract

The invention provides a detecting method for cyclic methyl siloxane in surface water and relates to a detecting method for cyclic methyl siloxane. The invention aims to solve the problems of long detecting time and incapability of accurate, qualitative and quantitative detecting under the existence of impurities of the present method for detecting the methyl siloxane. The detecting method comprises the following steps: 1) utilizing a liquid-liquid extraction method to preprocess a to-be-detected sample; 2) setting GC-MS-MS instrument parameters; 3) detecting a standard liquid; 4) detecting the to-be-detected sample. The detecting method for cyclic methyl siloxane in surface water, provided by the invention, has the characteristics of short detecting time, simplicity in operation, good preprocessing effect and capability of effectively eliminating interference and accurately, qualitatively and quantitatively detecting the cyclic methyl siloxane.

Description

technical field [0001] The invention relates to a method for detecting cyclomethylsiloxane. Background technique [0002] The molecular structure of methylsiloxane is divided into chain and ring. The chain is mainly L3-L15, and the ring is mainly D3-D7. Both silicon and oxygen atoms are alternately arranged as the skeleton, and the silicon atoms are directly connected to the methyl siloxane group to form a compound. All siloxanes are artificially synthesized, and the primary form of methyl siloxane is polymerized into silicone oil and silica gel with different degrees of polymerization. Among most cosmetics and daily necessities such as nail polish, shower gel, perfume, sunscreen products, antiperspirant, etc., a small part is also used in construction, automobile, food and other fields as antifoaming agent, lubricant, polishing agent, etc. [0003] As methyl siloxane is hydrophobic and oleophobic and has high volatility, nearly 90% of methyl siloxane in cosmetics and pers...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N30/88
Inventor 任南琪王艺张子峰陈川李一凡徐熙俊张若晨谢鹏
Owner HARBIN INST OF TECH
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