Investigation and application of liquid chromatography mass spectrometry in the analysis of polar, less volatile and thermal unstable organic pollutants in environmental and biological samples 4

... study the degradation behavior in ultrapure water, drinking water, rain water, river water and seawater under various pH and irradiation sources (sunlight, darkness, indoor incandescent lighting and ... propham (66 %), which probably underwent thermal degradation under the extraction conditions The results indicate that although carbamates tested in this study are thermally...

Ngày tải lên: 16/09/2015, 17:13

... freedom for the assignment of the variables under consideration The assignment of the main variables (A, B, C and D), two-variable interaction, and the level setting values of the main variables ... optimization of the MAE conditions To apply these techniques in practical applications, in this chapter I 138 demonstrated the application of these techniques...

Ngày tải lên: 16/09/2015, 17:13

... 88 An interesting result observed from Fig 4- 6 is that in the same solvent, the recovery increases in going from PAHs to PCBs, and then to triazines (i.e, increasing polarity of analyte) The recovery ... 88.1±3.7 89.8±3.2 91 .4 3.0 93.5 4. 5 41 .0±3.8 18 .4 4. 0 10 80.0±3.6 84. 2 4. 5 89.2±5.0 90.2 4. 0 93.2±2.9 94. 6±3.7 36.8±2.8 15.2±2 .4 15 79 .4 5.0 84. 6±3.6 86.6±3.6 87...

Ngày tải lên: 16/09/2015, 17:13

... 160.9 31 8.2 250.6 53. 3 3. 07 2.1 1. 43 60 52 45 * at pH 10.5, units of k and t1/2 are s-1 and s, respectively a incandescent lighting 64 3. 3 .3 Degradation of Propoxur in Natural Water In order to provide ... light intensity affects the K and t½ in each natural water sample K increases and t½ decreases accordingly when the light intensity increases in the ord...

Ngày tải lên: 16/09/2015, 17:13

... levels of the target analysts in soil samples before spiking 2. 3 .2. 2 Freshly spiked soils Freshly spiked soil samples were prepared by adding an appropriate volume of spiking solutions into the ... possible traces of PAHs, PCBs, triazines, carbamates and other organic contaminants, 100 g of each of the soil sample was immersed in 20 0 ml 46 each of methanol,...

Ngày tải lên: 16/09/2015, 17:13

... From Table 1- 5, it can be seen that various classes of pesticides have been determined by employing either LC-ESI-MS [11 1 -11 7, 12 1, 12 3] or LC-APCI-MS [11 8, 11 9, 12 2] The combination of SPE with ... ESI–PI–MS 5 10 11 6 GW off-line, 1L, SPE, ESI–NI–MS 5 10 11 5 SW off-line, 0.2L, SPE, ESI–PI–MS 20–30 11 7 Imidazolinone DW off-line, 2L, SPE, ESI–PI–MS about 11 3 Phenoxy...

Ngày tải lên: 16/09/2015, 17:13

... number of exchangeable hydrogens of the enol form and the keto form are different Two phenolic hydrogens of keto form, and two phenolic hydrogens and one aliphatic hydroxyl hydrogen of enol form ... work was supported by the Research Fund for the Doctoral Program of Higher Education (No 20110002110052) References Fig Fragmentation of curcumin in keto form and enol...

Ngày tải lên: 01/07/2014, 13:22

... corresponding with Simultaneous Determination of Various Macrolides by Liquid Chromatography/Mass Spectrometry 105 F i g T ot a l ion ch r om a t ogr a p h y (TI C, A) of m a cr olid e a n d t ia ... the simultaneous determination of macrolides The fragmentation patterns provide the confirmatory information of macrolides The relevance of these studies for the dete...

Ngày tải lên: 07/08/2014, 15:20

... Determination of Roxithromycin by Liquid Chromatography /Mass Spectrometry after Multiple-Dose Oral Administration in Broilers 39 Ta ble Concentration of roxithromycin in various tissues obtained ... Spectrometry after Multiple-Dose Oral Administration in Broilers 37 Fig Structure of roxithromycin (left) and erythromycin (right) Fig Representative...

Ngày tải lên: 07/08/2014, 17:22

... drop -in- drop system The aqueous phase of the outer drop contained the analyte of interest and was continuously delivered and aspirated away throughout the sampling The analytical response of the instrument ... involves the use of hollow fiber combination with liquid- phase microextraction It can be categorized into two- ii phase microextraction, and thr...

Ngày tải lên: 17/09/2015, 17:20

... METHOD 525.2 DETERMINATION OF ORGANIC COMPOUNDS IN DRINKING WATER BY LIQUID-SOLID EXTRACTION AND CAPILLARY COLUMN GAS CHROMATOGRAPHY/MASS SPECTROMETRY 1.0 SCOPE AND APPLICATION 1.1 This ... procedures for determination of organic compounds in finished drinking water, source water, or drinking water in any treatment stage The method is appl...

Ngày tải lên: 22/03/2014, 14:20

... concentration of EDTA (443 μg/L) was observed in a Table - Table – Recovery of EDTA fromtap water samples and tap water Recovery of EDTA from Milli-Q water and Milli-Q water Recovery of triplicate samples ... an EDTA analytical method to the Japanese Standard Methods for the Examination of Water Occurrence of EDTA in river water samples from three r...

Ngày tải lên: 05/09/2013, 10:15

... DEVELOPMENT OF IONIC LIQUID BASED LIQUID PHASE MICROEXTRACTION, AND ZEOLITE IMIDAZOLATE FRAMEWORKS BASED SORBENT PHASE BASED MICROEXTRACTION COMBINED WITH CHROMATOGRAPHY FOR APPLICATIONS IN ENVIRONMENTAL ... rapid development This thesis reports the development and application of ionic liquids (ILs) for liquid phase microextrac...

Ngày tải lên: 09/09/2015, 10:18