APCI organophosphorus

Figure 4. APCI (left) and ESI spectra of isopropyl ethylphosphonic acid, illustrating the lower abundance of adduct ions with APCI ions at mlz, 143 and 185 are adduct ions with MeOH mlz 175 is [M + Na]+. (Reprinted from Journal of Chromatography A, 794, R.M. Black and R.W. Read, Analysis of degradation products of organophosphorus chemical warfare agents and related compounds by liquid chromatography-mass spectrometry using electrospray and atmospheric pressure chemical ionisation, pp. 233-244 (1998), with permission from Elsevier)...

Online SPE-LC-UV/DAD with 40 /rm octadecyl sUica precolumns was developed for the determination of 11 organophosphorus compounds in ground- and wastewater samples with average error varying from 4 to 65%. The main problems encountered were the determination of dichlorvos, mevinphos, and malathion due to their low UV absorbance, the early breakthroughs of dichlorvos and mevinphos, and interferences in wastewater samples. SPE-LC-APCI/MS with 10 /rm... 

This technique can be used for OPP determination with an ultraviolet-diode array detector (UV/DAD) and ESI-MS, APCI-MS, ESI-MS/MS, and APCI-MS/MS. The separation mechanisms used for the separation of organophosphorus compounds are reverse-phase chromatography with alkyl-bonded silicas or apolar copolymers. 

Besides TSP-spectra from organophosphorus and different groups of polar pesticides, APCI, ESI, FAB and PBI spectra were presented. CID allowed the identification of pesticide residues and the confirmation and quantification of these compounds by TSP at concentrations < 100 ng L [175]. Barcelo et al. [239] extracted river water and spiked seawater samples by Cig Empore disks to concentrate orga-nophosphoras pesticides prior to identification and quantification while Bagheri et al. [247] for the same purpose used on-line SPE for phosphorus pesticides and TSP-LC-MS. 

The organophosphorus herbicide butamifos and its 4-nitrophenyl derivative were submitted to photodegradation. Products were analysed by APCI-LC-MS. 

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