1999
DOI: 10.1016/s0021-9673(99)00772-4
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Ultra-trace-level determination of polar pesticides and their transformation products in surface and estuarine water samples using column liquid chromatography–electrospray tandem mass spectrometry

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Cited by 107 publications
(92 citation statements)
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“…Table 4 shows no increased matrix suppression effects when comparing the Phaeozem (ME =91%)/Gleyic Acrisol (ME =88%) with the Orthic Acrisol (ME =87%)/Luvisol (ME =76%), despite their contrasting SOM contents. Similar results have been obtained by Steen et al (1999) indicating that the degree of ion suppression depends partly on the amount of co-extracted DOM, and partly on the nature of the samples. Kloepfer et al (2005) further demonstrated that the molecular weight distribution of organic material was crucial to matrix effects and this will complicate the situation.…”
Section: Selection Of An Appropriate Extractant For Matrix Effects Casupporting
confidence: 84%
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“…Table 4 shows no increased matrix suppression effects when comparing the Phaeozem (ME =91%)/Gleyic Acrisol (ME =88%) with the Orthic Acrisol (ME =87%)/Luvisol (ME =76%), despite their contrasting SOM contents. Similar results have been obtained by Steen et al (1999) indicating that the degree of ion suppression depends partly on the amount of co-extracted DOM, and partly on the nature of the samples. Kloepfer et al (2005) further demonstrated that the molecular weight distribution of organic material was crucial to matrix effects and this will complicate the situation.…”
Section: Selection Of An Appropriate Extractant For Matrix Effects Casupporting
confidence: 84%
“…The signal suppression by co-extracted humic acid, as indicated by a yellow color in methanol extracts, was studied by Steen et al (1999). The yellow color was also observed in soil extracts with sodium hydroxide-methanol extraction in our experiment, particularly for Phaeozem/Gleyic Acrisol soil owing to higher SOM content.…”
Section: Selection Of An Appropriate Extractant For Matrix Effects Casupporting
confidence: 56%
“…Chromatographic separation is generally optimized by performing a series of preliminary experiments involving testing of mobile phase composition to determine the conditions that provide the best compromise for all target analytes (Gros et al 2006;Baugros et al 2008). Optimization of MS parameters, including cone voltage and collision energy, is performed via flow injection analysis for each compound of interest (Steen et al 1999;Gros et al 2006;Baugros et al 2008).…”
Section: (Iii) Concentrationmentioning
confidence: 99%
“…The limited amount of charge per droplet is often exhausted for the conversion of water matrix components to free ions and is, therefore, no longer available for the formation of free ions of the target analytes (Steen et al 1999). Signal suppression is greater as NOM concentration increases and can also be influenced by sample pH owing to its impact on the co-extraction of NOM components during the sample clean-up process (Steen et al 1999;Renew & Huang 2004). For example, Renew & Huang (2004) reported that the biggest challenge associated with analysing antibiotics in wastewater samples was that the relatively high concentration of organic matter resulted in reduced sample extraction efficiency and suppression of the signal intensity with LC-MS analysis.…”
Section: (B) Water Matrix Effectsmentioning
confidence: 99%
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