guoyayun40

The use of
micellar systems such as CPE for separation and preconcentration
has attracted considerable attention in the last few years mainly
because it is in agreement with the “green chemistry” principles.
Green chemistry can be defined as those procedures for decreasing
or eliminating the use or generation of toxic substances for human
health and for the environment [12]. CPE is a green method for the
following reasons: (a) it uses as an extractor media diluted solutions
of the surfactants that are inexpensive, resulting in the economy of
reagents and generation of few laboratory residues; and (b) surfactants
are not toxic, not volatile, and not easily flammable, unlike
organic solvents used in liquid–liquid extraction [13,14].
CPE consist of three simple steps: (1) solubilization of the analytes
in the micellar aggregates; (2) clouding; (3) phase separation
for analysis. When a surfactant solution is heated over a critical
temperature, the solution easily separates into two distinct phases:
one contains a surfactant at a concentration below, or equal to, a
critical micelle concentration; the other is a surfactant-rich phase.
The hydrophobic compounds initially present in the solution and
bound to the micelles are extracted to the surfactant-rich phase.
This phenomenon is observed, in particular, for polyoxyethylene
surfactants and can be attributed to the two ethylene oxide segments
in the micelle that repel each other at low temperature when
they are hydrated and attract each other when the temperature
increases owing to the dehydration.

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yccxz809

8樓2010-12-14 12:22:14

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xiaomitaomm

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我覺得富集倍數(shù)高萃取率好是最重要的，因?yàn)閷?duì)于一些特殊基體，有機(jī)溶劑還是會(huì)少量用到

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走在前面

9樓2011-06-11 11:11:44

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櫻藤奈梨

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引用回帖:

9樓: Originally posted by xiaomitaomm at 2011-06-11 11:11:44
我覺得富集倍數(shù)高萃取率好是最重要的，因?yàn)閷?duì)于一些特殊基體，有機(jī)溶劑還是會(huì)少量用到

濁點(diǎn)萃取的萃取效率怎么計(jì)算啊謝謝

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