There are well over 500 registered pesticides worldwide for use in agr การแปล - There are well over 500 registered pesticides worldwide for use in agr ไทย วิธีการพูด

There are well over 500 registered

There are well over 500 registered pesticides worldwide for use in agricultural regions and
new agrochemicals are introduced to the marketplace continuously. This chapter deals with
the chemical analysis methods for the main pesticide chemical classes that are most
frequently analyzed with gas chromatography (GC) or liquid chromatography (LC) coupled
to mass spectrometry (MS). GC amenable pesticide chemical classes which do not require
derivatization include organochlorines (OCs), pyrethroids, organophosphorus pesticides
(OPs), triazines, and chloroacetanilides. In addition some transformation products of
organochlorines, triazines, and phenylureas are GC amenable and when derivatized some
transformation products of OPs, pyrethroids, and phenoxyacid herbicides are also GC
amenable. Specific methods have been developed with other injector choices than the
standard splitless injection for more thermally labile chemical classes such as
trihalomethylthio fungicides to extend the range of GC amenable pesticides. Some chemical
classes which are more polar such as phenoxy acid herbicides and carbamates can still be
analyzed by GC/MS methods but require derivatization to make them GC amenable. For
some other chemical classes a few pesticides have been analyzed by GC/MS usually
included in multiresidue methods but these methods have not tackled the entire range of
compounds within the chemical class. These include chemical classes such as
dicarboximides (vinclozin, iprodione), dinitroaniline (trifluralin, ethalfluralin),
dinitrophenol (dinoseb), and dithiocarbamate (triallate). A large number of pesticide classes
generally of higher polarity suffer from poor chromatographic performance, poor MS source
ionization or stability in GC/MS injectors, on-column, or in MS. For these chemical classes
and also to minimize the need for derivatization prior to GC there has been a gradual shift
to the development of new methods utilizing LC coupled with tandem mass spectrometry
(MS/MS). Tandem mass spectrometry in selected reaction monitoring (SRM) mode is
generally now more frequently used for LC rather than selected ion monitoring (SIM) with
LC/MS as the ionization process for LC/MS is a softer process (change processes to process)
than that of GC/MS ion sources such as EI and CI. For atmospheric pressure ionization
(API) sources most frequently used in LC/MS/MS most pesticides have only one ion
formed during ionization (the protonated or deprotonated molecular ion or sometimes an
adduct ion (eg. sodium or ammonium adduct)) and consequently there is little confirmation
ability. Tandem mass spectrometry allows for the controlled collision induced dissociation
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ผลลัพธ์ (ไทย) 1: [สำเนา]
คัดลอก!
There are well over 500 registered pesticides worldwide for use in agricultural regions andnew agrochemicals are introduced to the marketplace continuously. This chapter deals withthe chemical analysis methods for the main pesticide chemical classes that are mostfrequently analyzed with gas chromatography (GC) or liquid chromatography (LC) coupledto mass spectrometry (MS). GC amenable pesticide chemical classes which do not requirederivatization include organochlorines (OCs), pyrethroids, organophosphorus pesticides(OPs), triazines, and chloroacetanilides. In addition some transformation products oforganochlorines, triazines, and phenylureas are GC amenable and when derivatized sometransformation products of OPs, pyrethroids, and phenoxyacid herbicides are also GCamenable. Specific methods have been developed with other injector choices than thestandard splitless injection for more thermally labile chemical classes such astrihalomethylthio fungicides to extend the range of GC amenable pesticides. Some chemicalclasses which are more polar such as phenoxy acid herbicides and carbamates can still beanalyzed by GC/MS methods but require derivatization to make them GC amenable. Forsome other chemical classes a few pesticides have been analyzed by GC/MS usuallyincluded in multiresidue methods but these methods have not tackled the entire range ofcompounds within the chemical class. These include chemical classes such asdicarboximides (vinclozin, iprodione), dinitroaniline (trifluralin, ethalfluralin),dinitrophenol (dinoseb), and dithiocarbamate (triallate). A large number of pesticide classesgenerally of higher polarity suffer from poor chromatographic performance, poor MS sourceionization or stability in GC/MS injectors, on-column, or in MS. For these chemical classesand also to minimize the need for derivatization prior to GC there has been a gradual shiftto the development of new methods utilizing LC coupled with tandem mass spectrometry(MS/MS). Tandem mass spectrometry in selected reaction monitoring (SRM) mode isgenerally now more frequently used for LC rather than selected ion monitoring (SIM) withLC/MS as the ionization process for LC/MS is a softer process (change processes to process)than that of GC/MS ion sources such as EI and CI. For atmospheric pressure ionization(API) sources most frequently used in LC/MS/MS most pesticides have only one ionformed during ionization (the protonated or deprotonated molecular ion or sometimes anadduct ion (eg. sodium or ammonium adduct)) and consequently there is little confirmationability. Tandem mass spectrometry allows for the controlled collision induced dissociation
การแปล กรุณารอสักครู่..
ผลลัพธ์ (ไทย) 2:[สำเนา]
คัดลอก!
There are well over 500 registered pesticides worldwide for use in agricultural regions and
new agrochemicals are introduced to the marketplace continuously. This chapter deals with
the chemical analysis methods for the main pesticide chemical classes that are most
frequently analyzed with gas chromatography (GC) or liquid chromatography (LC) coupled
to mass spectrometry (MS). GC amenable pesticide chemical classes which do not require
derivatization include organochlorines (OCs), pyrethroids, organophosphorus pesticides
(OPs), triazines, and chloroacetanilides. In addition some transformation products of
organochlorines, triazines, and phenylureas are GC amenable and when derivatized some
transformation products of OPs, pyrethroids, and phenoxyacid herbicides are also GC
amenable. Specific methods have been developed with other injector choices than the
standard splitless injection for more thermally labile chemical classes such as
trihalomethylthio fungicides to extend the range of GC amenable pesticides. Some chemical
classes which are more polar such as phenoxy acid herbicides and carbamates can still be
analyzed by GC/MS methods but require derivatization to make them GC amenable. For
some other chemical classes a few pesticides have been analyzed by GC/MS usually
included in multiresidue methods but these methods have not tackled the entire range of
compounds within the chemical class. These include chemical classes such as
dicarboximides (vinclozin, iprodione), dinitroaniline (trifluralin, ethalfluralin),
dinitrophenol (dinoseb), and dithiocarbamate (triallate). A large number of pesticide classes
generally of higher polarity suffer from poor chromatographic performance, poor MS source
ionization or stability in GC/MS injectors, on-column, or in MS. For these chemical classes
and also to minimize the need for derivatization prior to GC there has been a gradual shift
to the development of new methods utilizing LC coupled with tandem mass spectrometry
(MS/MS). Tandem mass spectrometry in selected reaction monitoring (SRM) mode is
generally now more frequently used for LC rather than selected ion monitoring (SIM) with
LC/MS as the ionization process for LC/MS is a softer process (change processes to process)
than that of GC/MS ion sources such as EI and CI. For atmospheric pressure ionization
(API) sources most frequently used in LC/MS/MS most pesticides have only one ion
formed during ionization (the protonated or deprotonated molecular ion or sometimes an
adduct ion (eg. sodium or ammonium adduct)) and consequently there is little confirmation
ability. Tandem mass spectrometry allows for the controlled collision induced dissociation
การแปล กรุณารอสักครู่..
ผลลัพธ์ (ไทย) 3:[สำเนา]
คัดลอก!
มีดีกว่า 500 ขึ้นทะเบียนยาฆ่าแมลงทั่วโลกเพื่อใช้ในภาคการเกษตร และสารเคมีใหม่
แนะนำสู่ตลาดอย่างต่อเนื่อง บทนี้เกี่ยวกับ
วิธีวิเคราะห์ทางเคมี สำหรับหลักการใช้สารเคมีป้องกันกำจัดศัตรูพืชที่เรียนส่วนใหญ่
วิเคราะห์ด้วยเครื่องแก๊สโครมาโตกราฟ ( GC ) หรือ Liquid Chromatography ( LC ) คู่
ถึงมวลสาร ( MS )
การแปล กรุณารอสักครู่..
 
ภาษาอื่น ๆ
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