Tìm thấy 20+ kết quả cho từ khóa "GC/MS analysis"
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Chiral analysis of the TFA- derivatives of d-/l-isomers of MA, AP and pOHMA in urine of an MA abuser by chiral GC/MS.. Figure 1.9) does also not need derivatization. Detection limits d of MA obtained by various methods. Figure 1.4): 0.5 and 0.05 ng/1 µ L, respectively;. the usual GC/MS analysis ( >. the chiral GC/MS analysis ( >. the usual pretreatment-HPLC analysis ( >. Figure 1.5): 5 ng/. the Simon’s reaction-HPLC analysis ( >. Figure 1.6): 1 ng/20 µ L. the usual LC/MS analysis ( >.
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Th e residue is dissolved in 100 µ L methanol for GC or GC/MS analysis. GC and GC/MS analysis. GC/MS conditions. GC/MS. carrier gas: He (2.0 mL/min). Assessment of the method. For GC analysis of carbamate pesticides, an FTD detector is recommendable, because it is specifi c and sensitive, and is not infl uenced by impurities and organic solvents appreciably.. Table 4.2 shows retention GC and GC/MS analysis. Retention times of carbamate pesticides obtained by GC*.
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Aft er cooling, a 1- µ L aliquot of it is injected into GC/MS.. One of the above dry residues is dissolved in 2 mL of solution of diazomethane in ethyl ether i , left at room temperature for 30 min and evaporated to dryness. A 1- µ L of the solution is subjected to the GC/MS analysis..
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Th e GC/MS analysis for phenothiazines shows some disadvantages as follows. ① Pheno- thiazines with long side chains are not suitable for GC/MS analysis. especially, those with long piperazinyl or hydroxyl side chains cannot be detected by either GC or GC/MS. ② Prometha- zine, isothipendyl and ethopropazine do not give molecular ions, but give big fragment peaks at m/z 58 or 72 only, which are not useful for identifi cation of the compounds. LC/MS analysis [8].
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Because they are nonvolatile and highly adsorptive, derivatization is required for their GC and GC/MS analysis [8–10].. other 3 compounds are immediately decomposed by heat of injection chamber, resulting in the detection of decomposition products. For bromadiolone, however, it is diffi cult to detect the compound by GC (/MS) aft er any derivatiza- tion ( >. MS analysis of warfarin, coumachlor and bromadiolone without derivatization are shown in >.
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In this chapter, the methods of analysis of tetrodotoxin in human specimens by GC/MS and HPLC are described [3].. Structures of tetrodotoxin (TTX) and its analogs.. GC/MS analysis. it cannot be analyzed it by GC/MS in its unchanged form.. 191), which can be trimethylsilylated [C 9 base-(TMS) 3 , M.W. 407] for GC/MS analysis ( >. Other common chemicals used were of the highest purity commercially available..
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A TIC and a gas chromatogram obtained by capillary GC/MS and packed-column GC-FPD, respectively, are shown in >. TIC and gas chromatogram for malathion and its metabolites obtained by capillary GC/MS and packed-column GC-FPD, respectively. Th ey are almost the same as described in the section of GC and GC/MS analysis.. LC: any instrument equipped with a UV detector or a photodiode array detector can be used, regardless of its manufacturer..
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For analysis of nicotine and cotinine in human blood and/or urine, methods by GC [3–5], GC/MS [6–8] and HPLC [9–13] were reported. In this chapter, the methods for GC/MS analy- sis of nicotine and cotinine in blood and for HPLC (UV detection) analysis of nicotine in to- bacco extract solutions are presented.. GC/MS analysis of nicotine and cotinine in blood and urine. Nicotine and cotinine (Sigma, St.
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In this chapter, a method for wide-bore capillary GC/MS analysis of benzalkonium chlo- rides is described and an HPLC method is also mentioned briefl y.. GC/MS analysis. GC/MS conditions. Figure 2.2): m/z 50–509. Total ion chromatogram (TIC) for the authentic benzalkonium chlorides. Liquid-liquid extraction. To the com- bined residue, 500 µ L blank serum is added and mixed well to prepare 1 µ g/mL standard solution d for C 12 , C 14 and C 16 compounds of benzalkonium chlorides..
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In this chapter, some details on GC/MS [7], HPLC with fl uorescence detection [10] and HPLC-UV [14], aft er each derivatization for analysis of PAAHs, are described.. GC/MS analysis [7]. when low levels of the compounds are dealt with, the tools made of Tefl on should be used [13]..
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Th e author presents some details of confi rmatory tests using GC/MS and LC/MS in this section.. GC/MS. Th e compounds with an amino group and a hydroxyl group are trifl uoroacetylated and tri- methylsilylated, respectively, for GC/MS analysis [11]. Most drugs can be confi rmed by GC/MS aft er derivatization. GC/MS is indispensable for analysis of illicit opiates and amphetamines..
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In this chapter, the procedures for GC/MS and LC/MS analyses of MDAs in the forms of tablets and those for GC/MS analysis of MDAs and their main metabolites 4-hydroxy-3-me- thoxymethamphetamine ( HMMA) and 4-hydroxy-3-methoxyamphetamine ( HMA) in urine specimens are presented.. MDA, MDMA and MDEA can be purchased from Sigma (St.
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Also for estimating peaks appearing in the total ion chromatograms (TIC) using each RI value, the same GC conditions and the n-alkane standards are adopted for the GC/MS analysis.. Analysis of chemical warfare agents by thermal desorption GC. Th is methods is eff ective for use, when analytical results are rapidly needed or the concentration of a target compound in the atmosphere is low. It is applicable to analysis of volatile compounds in solid specimens, such as soil and clothes.
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Simultaneous GC/MS analysis of β-blockers and their metabolites [1–3]. Acquisition of the authentic standard drugs and their preparation are the same as described in the HPLC analysis section. 1 M Phosphate buff er solution (pH 7.0): a 34.0-g aliquot of potassium dihydrogenphos- phate is dissolved in distilled water, followed by adjustment of the solution to pH 7.0 with 10 M NaOH. GC/MS conditions.
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In this chapter, a method for GC/MS analysis of hair dye components is described.. A 10-mg aliquot each of the above compounds a is dissolved in 100 mL metha- nol to prepare 100 µ g/mL standard solution in a volumetric fl ask.. 416 Hair dyes. Structures and LD 50 values of principal hair dye couplers [1].. Structures and LD 50 values of principal hair dye components for oxidative polymerization [1].. 417 Hair dyes. GC/MS analysis. GC/MS conditions. Figure 3.3): m/z 10–509 e .
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In this chapter, a detailed procedure for simple GC/MS analysis of PCP in blood and urine is pre- sented.. Structures of PCP and pethidine (IS).. GC/MS conditions. a 2- µ L aliquot of it is injected into GC/MS being operated in the mass chromatographic mode.. A calibration curve is constructed by adding various concentrations of PCP and 100 ng IS to the vials containing 1 mL of blank whole blood or urine and 8 mL distilled water each, followed by the above procedure.
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For analysis of ethylene glycol, methods by GC [5–8], GC/MS [9–11] and HPLC [12–14]. In this chapter, a method of GC/MS analysis of ethylene glycol in human plas- ma is presented.. Ethylene glycol and phenylboronic acid can be purchased from Sigma (St. ethylene glycol-d 4 from Aldrich (Milwaukee, WI, USA, No. Other common chemicals used were of the highest purity commercially available..
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In this chapter, a method for headspace GC/MS analysis of naphthalene is presented utiliz- ing its volatile property.. Naphthalene can be purchased from Sigma (St. Other common chemicals used are of the highest purity commercially available.. a diff erent volume of the naphthalene solution (1–10 µL containing 0.1–1 µg) and 10 µL (containing 1 µg) of naphthalene-d 8 (IS) solution are placed in each glass vial with a Tefl on-septum cap containing 0.2 mL of blank whole blood..
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Since morphine and codeine are fi nally excreted into urine in the conjugated forms with glucuronic acid [1–3], it is necessary to hydrolyze the conjugated forms of these compounds before GC/MS analysis.. Th e detection of 6-acetylmorphine is recommendable for diagnosis of heroin use, because of its relatively long half-life in the body [4].. in the near future, LC/MS may become a main tool for analysis of opiates and their metabolites.
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Th e weight of p-dichlorobenzene being sold as a moth repellant is about 4 g;. the crystal mass of the same compound being used for a toilet mothball ranges from 40 to 200 g. in this chapter, a method for headspace GC/MS analysis of p-dichlorobenzene is presented utilizing the vola- tile property.. p-Dichlorobenzene and p-dichlorobenzene-d 4 (product No.