A rapid and highly sensitive method is described for the extraction and determination of diand tributyltin in PVC samples using headspace liquid phase microextraction followed by an analysis with graphite furnace atomic absorption spectrometry (HSLPME/GFAAS). The analytes were derivatized in situ with sodium tetraethylborate and concentrated in a 2 μl microdrop of benzyl alcohol suspended from ...

The pressing issue of earthy and musty odor compounds in natural waters, which can affect the organoleptic properties of drinking water, makes it a public health concern. A simple and sensitive method for simultaneous analysis of five odorants in environmental water was developed by headspace solid-phase microextraction (HS-SPME) coupled to chromatography-mass spectrometry (GC-MS), including ge...

carbon disulfide is used predominantly in the manufacture. it has affects the nervous system. in this study, the applicability of spme as a passive sampler for determination of carbon disulphide in air was studied. effect of sampler and environmental parameters on uptake of carbon disulphide was studied as well. four fibers were tested to select the best sampler for determine carbon disulfide i...

this research is on the improvement of the procedure to determination of trace levels of antidepressant drug; fluoxetine in wastewaters. in this research a silica based sol-gel was applied for the extraction of fluoxetine from water samples. this two-phase technique is consisting of aqueous samples of fluoxetine (donor phase) and silica based nanocomposite prepared by sol-gel technique (accepto...

In this study the volatile composition of six samples dark chocolates varying in cocoa roasting time (30.5, 34.5 and 38.5 min) geographical origin (Ecuador Ghana) was characterized by headspace solid-phase microextraction (HS-SPME) followed gas chromatography-mass spectrometry (GC-MS). One hundred twenty-one different compounds were identified using a carboxen/polydimethylsiloxane (CAR-PDMS) fi...

A novel method is reported, whereby screen-printed electrodes (SPELs) are combined with dispersive liquid-liquid microextraction. In-situ ionic liquid (IL) formation was used as an extractant phase in the microextraction technique and proved to be a simple, fast and inexpensive analytical method. This approach uses miniaturized systems both in sample preparation and in the detection stage, help...

Microalgae have great potential to become a new crop that could significantly impact the world's need for food in 21st century. Despite their as ingredient, microalgae social acceptance food. In addition, organoleptic traits, such aroma, are key factors humans accept part of diet. this sense, some requirements culture, species, and environmental conditions extremely important these microorganis...

Ionogels, a family of hybrid materials in which ionic liquids (ILs) are confined in a sol-gel network, are receiving much attention in a variety of scientific and technological fields. In this work, ionogels derived from three different ILs based on the anion bis(trifluoromethanesulfonyl)imide (TFSI), namely 1-butyl-3-methylpyridinium bis(trifluoromethanesulfonyl)imide ([C4C1Py][TFSI]), 1-butyl...

Recent improvements in the detection of alkylated aromatic compounds from gasoline accelerants in arson debris use expensive GC-MS-MS instrumentation that is not available to most crime laboratories. This research project uses solid-phase microextraction (SPME), an inexpensive pre-concentration method, to achieve high sensitivities in the analysis of alkylated aromatic compounds.