Determination method for lead content in polydimethylsiloxane and emulsion thereof

A technology of polydimethylsiloxane and determination method, which is applied in the field of physical and chemical testing, can solve problems such as cumbersome operation procedures, incomplete digestion, and long reaction time, and achieve the effects of accurate detection results, thorough digestion, and short reaction time

Inactive Publication Date: 2017-08-22
SHANDONG INST FOR FOOD & DRUG CONTROL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] For the detection of lead content in polydimethylsiloxane and its emulsion in my country, GB 30612-2014 adopts the national mandatory standard GB 5009.12-2010 Determination of lead in food, the pretreatment adopts dry ashing method, and the operation rules of this method Complicated, long reaction time, incomplete digestion, and low recovery rate, not suitable for the determination of lead in batch samples

Method used

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  • Determination method for lead content in polydimethylsiloxane and emulsion thereof
  • Determination method for lead content in polydimethylsiloxane and emulsion thereof
  • Determination method for lead content in polydimethylsiloxane and emulsion thereof

Examples

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Effect test

Embodiment 1

[0027] A method for assaying lead content in polydimethylsiloxane, the steps comprising:

[0028] (1) Sample processing:

[0029] Accurately weigh 0.5g of the polydimethylsiloxane sample to be tested into a polytetrafluoroethylene digestion tank, add 4mL of nitric acid and 4mL of hydrofluoric acid respectively, after microwave digestion (see Table 1 for the digestion conditions), put the acid on the electric heating plate 140 ℃ to 1~2mL of the remaining liquid, transferred to a 25mL plastic volumetric flask, shaken to volume with ultrapure water and ready to be tested.

[0030] Table 1 Determination conditions of microwave digestion apparatus

[0031]

[0032] (2) Solution preparation:

[0033] Standard blank solution: prepare 1wt% nitric acid deionized aqueous solution as the standard blank solution;

[0034] Get the lead standard solution in a volumetric flask, make it to volume with a standard blank solution, and prepare a lead standard stock solution of 100mg / L, then...

Embodiment 2

[0056] The assay method of lead content in polydimethylsiloxane emulsion, the step comprises:

[0057] (1) Sample processing:

[0058] Accurately weigh 0.5g of the polydimethylsiloxane emulsion sample to be tested in a polytetrafluoroethylene digestion tank, add 4mL of nitric acid and 4mL of hydrofluoric acid respectively, after microwave digestion (see Table 1 for the digestion conditions), remove the acid on the electric heating plate Rush to 1~2mL of the remaining liquid at 140°C, transfer to a 25mL plastic volumetric flask, dilute with ultrapure water and shake well for testing.

[0059] (2) Solution preparation: the method is the same as (2) in Example 1.

[0060] (3) Measurement by graphite furnace atomic absorption spectrometer: the method is the same as (3) in Example 1.

[0061] The method verification of the present invention

[0062] 1, detection limit: with embodiment 1.

[0063] 2. Repeatability:

[0064] For the polydimethylsiloxane emulsion sample, measure ...

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Abstract

The invention discloses a determination method for the lead content in polydimethylsiloxane and emulsion thereof. At a pre-treatment phase, a sample is prepared by adopting a method of performing microwave digestion for mixed acid dissolution of hydrofluoric acid and nitric acid and the sample is determined by a graphite furnace atomic absorption spectrophotometer; meanwhile, two types of matrix modifiers including palladium nitrate and diammonium phosphate are added. The lead content in the polydimethylsiloxane and the emulsion thereof can be rapidly and accurately determined. Compared with traditional dry-process digestion pre-treatment and no hydrofluoric acid, the determination method has the advantages of less sampling amount, short reaction time, complete digestion, less loss of elements to be determined and easiness for operation. By adopting the determination method, after characteristics of the polydimethylsiloxane and the emulsion thereof are determined by adopting optimized related temperature raising procedure, charring temperature and atomization temperature of a graphite furnace atomic absorption spectrometry, the two types of matrix modifiers are used for eliminating interference; a recycling rate is high and a determined result is accurate.

Description

technical field [0001] The invention belongs to the technical field of physical and chemical testing, and in particular relates to a method for determining the lead content in polydimethylsiloxane and its emulsion. Background technique [0002] Polydimethylsiloxane is a kind of hydrophobic silicone material, which is widely used in food, medicine, daily chemical products, construction and other fields. Polydimethylsiloxane is a food-grade defoamer, which can be used for defoaming during brewing and fermentation of medicine and food. Because it is non-toxic and does not cause physiological reactions in the human body, it is used as a medical defoamer for the treatment of acute pulmonary edema and flatulence. Polydimethylsiloxane is a defoamer food additive allowed by the state to prevent the cooking oil of fried chicken nuggets from foaming. Polydimethylsiloxane and its derivatives are high-quality raw materials for cosmetics. They have good skin care functions, can lubrica...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/33
CPCG01N21/33
Inventor 崔玉花刘艳明董瑞祝建华张喜琦赵发田其燕高喜凤陈晓媛于文江
Owner SHANDONG INST FOR FOOD & DRUG CONTROL
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