By Hans-Peter Thier, Jochen Kirchhoff
This choice of up to date equipment for examining pesticide residues represents these confirmed equipment which are of so much price to the analyst.
The equipment selected reveal a very excessive regular of reliability and feature all been proven by means of at the very least another particularly certified laboratory. also they are provided in such precise and with no trouble comprehensible shape that analysts utilizing them can't very likely be left unsure approximately the way to continue. all of the unmarried equipment specifies the substrates to which it really is acceptable and on which it's been verified, between them nutrients vegetation, kept commodities, processed meals of vegetable and animal foundation, feedstuffs, forage and fodder vegetation, soil, and water.
either Volumes organize the compound-specific tools within the alphabetical order of the compound names. additionally they include indexes to supply easy accessibility to the specified technique. the one tools every one include the chemical identify and the structural formulation of the respective compound. a number of equipment are preceded by way of a desk during which chemical names and structural formulae are offered together for all compounds.
Read or Download Manual of Pesticide Residue Analysis, Volume 2 PDF
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Additional info for Manual of Pesticide Residue Analysis, Volume 2
Sample text
For extraction of phenoxyalkanoic acid residues, adjust the pH of the sample to 2. 2. Using water jet pump suction, allow the sample to pass through the disposable column at a flow rate of 15 to 20 ml/min (see Figure). Rinse the graduated cylinder and the beaker with 10 ml water and suck the rinsings also through the column. Mount the activated charcoal cartridge onto the disposable column using an adapter, and dry the column filling by passing a stream of air through it for 5 min. Remove the activated charcoal cartridge.
A 1-1 water sample, with internal standard added, is passed through this column with suction, whereby the compound residues are retained in the column. The column is dried by passing a nitrogen stream through it, and then eluted with an acetonitrile-methanol mixture. The eluate is evaporated to a small volume and used directly for the final chromatographic determination. Heavily contaminated water samples require an additional cleanup of the eluates. 5 at the lower end Chromatographic tube, 9 mm i.
With suction, pass 30 ml eluting mixture through the column. Collect the eluate in a 50-ml pear-shaped flask and evaporate it to a small volume or just to dryness. Use the residue directly for the chromatographic determination. 4, e. g. proceeding as described in the respective chapters of the Multiresidue Methods S 8 or S 19 (see pp. 283 ff and pp. 383 ff, respectively, Vol. 1). 5 in Cleanup Method 8, p. 44, this Volume. 7 Important points Polar compounds which are poorly retained on the RP-18 material may yield poor recoveries.
