nlwxpearo
Joined: 13 Dec 2010
Posts: 520
Read: 0 topics
Warns: 0/5
Location: England
|
 Posted: Thu 10:31, 10 Feb 2011 Post subject: 7 cosmetics anion SPE - Ion Chromatography _3504 |
|
|
7 cosmetics anion SPE - Ion Chromatography
Use,[link widoczny dla zalogowanych], can cause pulmonary edema, skin burns and mucosal allergy symptoms. Tellurium is a chronic toxicology,[link widoczny dla zalogowanych], acute poisoning is rare. Tellurium in the alloy, rubber, glass, ceramics and electronics industries are more commonly used, may endanger the health of workers】. Therefore, the monitoring of workplace air concentrations of tellurium is very important. Currently, the national occupational health standards in the method for the determination of tellurium hydride atomic fluorescence spectrometry and flame atomic absorption spectrometry, but the pre-membrane air sampling atmospheric pressure wet digestion and mock or traditional, a few hours, time-consuming energy consumption and serious environmental pollution, poor reproducibility ridicule. Microwave digestion is a new sample preparation techniques, because of its energy-saving, time saving,[link widoczny dla zalogowanych], less pollution, easy to complete loss and decomposition characteristics, the sample has become an indispensable means of digestion. The author explores the use of microwave digestion after the application of microporous membrane pre-treatment by hydride generation atomic fluorescence spectrometry method of tellurium in the workplace. 1 Materials and Methods 1.1 Instruments and reagents AFS for a 3100 double-channel atomic fluorescence spectrometer (Beijing Branch Chong Hoi Kwong Author: Center for Disease Control and Prevention Dalian test the physical and chemical technology (Dalian, Liaoning 116021) Author: Li-Jun Yang (1972 a ), female,[link widoczny dla zalogowanych], competent technicians,[link widoczny dla zalogowanych], engaged in physical and chemical inspection. Instrument Co., Ltd.), MWS-2 Microwave Pressure Digestion infrared temperature measurement instrument (Germany Berghof company) supporting the DAP-type pressure digestion of a 60K pot, AS-2 type high-performance hollow Te cathode lamp. The water was deionized water, laboratory glassware were soaked overnight in 20% nitric acid treatment. 100p ~ g / ml stock standard solution of tellurium 『National Research Center, GBW (E) 080548], the standard use of liquid tellurium (Te standard stock solution will be progressively diluted 1p ~ g/m1), nitrate (excellent grade pure ), hydrogen peroxide (AR), 1.2mol / L hydrochloric acid [learn l0ml hydrochloric acid (superior grade pure) water to 100m1], 1g / L ferric chloride solution [Weigh 1.0g ferric chloride ( analytical grade) was dissolved in 1000ml deionized water], 20g / L solution of potassium borohydride [Weigh 10.0g of potassium borohydride (analytical grade) dissolved in 5g / L sodium hydroxide solution 500ml, the temporary use of the existing service]. 1.2 Experimental methods 1.2.1 Sampling methods will be installed microporous membrane sample folder to 2L/min the flow of air samples collected 15min, the membrane facing the inside of the dust off 2 times, to release the filter Save diaphragm. Collected without connecting the control air sampler. 1.2.2 Digestion of the porous membrane after the sample placed in acid leaching and dry cleaning Teflon ~ TFM pressure digestion tank, adding 3mlHNO and 2mlH20, according to a predetermined digestion process heating digestion.
The post has been approved 0 times
|
|
