[Simultaneous determination of phosphorous by-products and inorganic anions in glyphosate mother liquor by ion chromatography with suppressed-conductivity detection].
The by-product anion content was an important index for the evaluation of pesticide glyphosate's productivity technology. A method was developed for the simultaneous determination of glyphosate, phosphorous by-products and other trace impurity anions in the mother liquor of glyphosate procedure by ion chromatography (IC). The sample was diluted with deionized water and filtrated by 0.22 microm nylon filter membrane, and then analyzed by IC directly without anymore pretreatment. The analytical column was Dionex IonPac AS11-HC (250 mm x 4 mm) with a guard column IonPac AG11-HC (50 mm x 4 mm). Gradient KOH eluent generated by an eluent generation cartridge was used at a flow rate of 1.0 mL/min. The detection was performed by a Dionex suppressed conductivity detector. The quantitative analysis of external standard calibration curves was used. The linear ranges of the method for glyphosate, methyl glyphosate, hexamethylphosphoramide (HMPA), glyphosine, phosphite, phosphate, chloride and sulfate were 0.1 - 20 mg/L (r = 0.9995), 0.1 - 20 mg/L (r = 0.9993), 0.1 - 50 mg/L (r = 0.9999), 0.25 - 50 mg/L ( r = 0.9998), 0.05 - 20 mg/L (r = 0.9999), 0.2 - 50 mg/L ( r = 0.9985), 0.02 - 20 mg/L (r = 0.9999) and 0.05 - 50 mg/L (r = 0.9980), respectively. The average recoveries were 93.7% - 104.0% with the relative standard deviations less than 2.5% (n = 7), and the detection limits (S/N = 3) were 0.002 - 0.025 mg/L. The method has been applied to determine the contents of glyphosate, phosphorous by-products and inorganic anions in the mother liquor of glyphosate with satisfactory results.
Shanghai Lab., Thermo Fisher Scientific Inc., Shanghai 201203, China. huzy82@126.com
Zhongyang
Z
Hu
Mingli
M
Ye
Guangwen
G
Pan
Tingting
T
Zhang
Naifei
N
Zhong
D000838:Anions / Q000032:analysis; D002852:Chromatography, Ion Exchange; D004553:Electric Conductivity; D005998:Glycine / Q000031:analogs & derivatives* / Q000737:chemistry; D007287:Inorganic Chemicals / Q000032:analysis*; D010758:Phosphorus / Q000032:analysis*; D012996:Solutions / Q000737:chemistry; D000097797:Glyphosate
D000838:Anions; D005998:Glycine; D007287:Inorganic Chemicals; D010758:Phosphorus; D012996:Solutions; D000097797:Glyphosate