Liquid Chromatographic Determination of Sulfentrazone in Soil

1999 ◽  
Vol 82 (5) ◽  
pp. 1214-1216 ◽  
Author(s):  
G Anthony Ohmes ◽  
Thomas C Mueller
Keyword(s):  
Chromatographic Determination ◽  
Soil Samples ◽  
Ultraviolet Detection ◽  
Liquid Chromatographic Separation ◽  
Relative Standard ◽  
Limit Of Quantitation ◽  
Liquid Chromatographic Determination ◽  
Liquid Chromatographic ◽  
Soluble Components

Abstract A rapid method for the determination of sulfentrazone in soils is described. The method consists of extraction of soil samples with methanol, filtration, liquid chromatographic separation of methanol-soluble components through a C18 column, and ultraviolet detection at 220 nm. Recoveries from fortified surface soils were >85% for sulfentrazone. Average relative standard deviations over the soils examined was 7.7%. A conservative lower limit of quantitation for sulfentrazone was 40 ng/g soil.

Liquid Chromatographic Determination of Norflurazon and Its Initial Metabolite in Soil

1994 ◽  
Vol 77 (3) ◽  
pp. 752-755 ◽  
Author(s):  
William T Willian ◽  
Thomas C Mueller
Keyword(s):  
Limit Of Detection ◽  
Chromatographic Determination ◽  
Soil Samples ◽  
Detector Response ◽  
Liquid Chromatographic Separation ◽  
Relative Standard ◽  
Liquid Chromatographic Determination ◽  
Liquid Chromatographic ◽  
Soluble Components

Abstract A rapid, sensitive method for the determination of norflurazon in 4 soils is described. Data on the initial soil metabolite is also obtained in soils with low organic matter. The method consists of extraction of soil samples with methanol, filtration, liquid chromatographic separation of methanol-soluble components by using a C18 column, and fluorescence detection with excitation at 294 nm and emission measured at 398 nm. Recoveries from fortified soils were >90% for norflurazon and >80% for desmethylnorflurazon from the Shipps, Lexington, and Harkey soils. Average percent relative standard deviations over the soils examined was 5.5% for norflurazon and 8.7% for desmethylnorflurazon. The limit of detection for norflurazon was 10 ng/g soil, whereas the limit of detection for desmethylnorflurazon was 100 ng/g soil because of its smaller relative detector response.

Liquid Chromatographic Determination of 5-(Methylamino)-2-Phenyl-4-[3-(Trifluoromethyl)phenyl]-3-(2H)-Furanone in Soil

1990 ◽  
Vol 73 (2) ◽  
pp. 298-299
Author(s):  
Thomas C Mueller ◽  
Philip A Banks ◽  
Parshall B Bush ◽  
William C Steen
Keyword(s):  
Limit Of Detection ◽  
Chromatographic Determination ◽  
Soil Samples ◽  
Soil Types ◽  
Liquid Chromatographic Separation ◽  
Relative Standard ◽  
Limit Of Quantitation ◽  
Liquid Chromatographic Determination ◽  
Liquid Chromatographic

Abstract A rapid, sensitive method is described for the determination of5-(methylamlno)-2-phenyl-4-[3-(trlfluoromethyl)phenyl]-3- (2M)-furanone (RE-40885) concentrations in 3 soil types. The method consists of extraction of soil samples with methanol, filtration, liquid chromatographic separation of methanolsoluble components using a C18 column, and UV detection at 275 nm. Recoveries were 94, 96, and 94% from the Greenville, Cecil, and Dothan soils, respectively. Average relative standard deviation was 8.0% in the Greenville soil. The qualitative limit of detection was 20 ppb and the limit of quantitation was 40 ppb in 25 g soil samples.

Liquid Chromatographic Determination of Fluometuron and Metabolites in Soil

1991 ◽  
Vol 74 (4) ◽  
pp. 671-673 ◽  
Author(s):  
Thomas C Mueller ◽  
Thomas B Moorman
Keyword(s):  
Limit Of Detection ◽  
Chromatographic Determination ◽  
Silt Loam ◽  
Soil Extracts ◽  
Liquid Chromatographic Separation ◽  
Relative Standard ◽  
Liquid Chromatographic Determination ◽  
Liquid Chromatographic ◽  
Soluble Components

Abstract A rapid, sensitive method Is described for the determination of fluometuron and Its soil metabolites In 4 soil types. The method consists of extraction of moist soil samples with methanol, filtration, liquid chromatographic separation of methanol-soluble components using a C18 column, and fluorescence detection with excitation at 292 nm and emission measured at 345 nm. Fluometuron recoveries from fortified soils were >90% from the Dundee, Okalona, Cecil, and Ships soils. Recoveries from a Dundee silt loam for desmethyl fluometuron, 3-(trlfluoromethyl)phenyl urea, and 3- (trifluoromethyl)anillne were 77, 77, and 35%, respectively. Average percent relative standard deviations of Dundee soil extracts were 5.3% for fluometuron and <8.0% for each metabolite. The limit of detection for fluometuron and each of its soil metabolites was 25 ng/g soil.

Liquid Chromatographic Determination of Glyburide (Glibenclamide) and Its Related Compounds in Raw Materials

1993 ◽  
Vol 76 (5) ◽  
pp. 962-965
Author(s):  
Normand Beaulieu ◽  
Susan J Graham ◽  
Edward G Lovering
Keyword(s):  
Raw Materials ◽  
Chromatographic Determination ◽  
Assay Method ◽  
Liquid Chromatographic Method ◽  
Relative Standard ◽  
Limit Of Quantitation ◽  
Liquid Chromatographic Determination ◽  
Liquid Chromatographic ◽  
Related Compounds

Abstract A liquid chromatographic method has been developed for the determination of glyburide and 3 known related compounds in drug raw materials. The lower limit of quantitation of the related compounds is about 0.02%. Evaluation of 9 drug raw materials revealed total impurities ranging from 0.17 to 0.65%. The relative standard deviation of the assay method is <1%.

Liquid Chromatographic Determination of Amiodarone Hydrochloride and Related Compounds in Raw Materials and Tablets

1994 ◽  
Vol 77 (6) ◽  
pp. 1447-1453 ◽  
Author(s):  
Pauline M Lacrok ◽  
Norman M Curran ◽  
Wing-Wah Sy ◽  
Dennis K J Goreck ◽  
Pierre Thibault ◽  
...  
Keyword(s):  
Raw Materials ◽  
Chromatographic Determination ◽  
Raw Material ◽  
Liquid Chromatographic Method ◽  
Limit Of Quantitation ◽  
Liquid Chromatographic Determination ◽  
Liquid Chromatographic ◽  
Amiodarone Hydrochloride ◽  
Related Compounds

Abstract A liquid chromatographic method for the determination of amiodarone hydrochloride and 10 related compounds in drug raw material and for assay of drug in tablets was developed. The method specifies a 3 jxm Hypersil nitrile column (150 × 4.6 mm), a mobile phase of 1 + 1 acetonitrile–ammonium acetate buffer (0.1 M adjusted to pH 6.0 with 0.1 M acetic acid), a flow rate of 1 mL/min, and detection at 240 nm. The lower limit of quantitation of the related compounds is 0.02% or less. Drug contents in 2 raw material samples were 100.1 and 99.9% and ranged from 98.2 to 99.4% in 3 tablet formulations. Impurity levels in 2 samples of raw material from different manufacturers were ca 0.4%. The presence of 3 of the known related compounds in these samples was confirmed by liquid chromatographymass spectrometry. The method applied to raw materials was evaluated by a second laboratory and found to be satisfactory.

Liquid Chromatographic Determination of Glyphosate and Aminomethylphosphonic Acid (AMPA) in Environmental Water: Collaborative Study

1991 ◽  
Vol 74 (2) ◽  
pp. 317-323 ◽  
Author(s):  
Mark E Oppenhuizen ◽  
John E Cowell
Keyword(s):  
Collaborative Study ◽  
Chromatographic Determination ◽  
Environmental Water ◽  
Aminomethylphosphonic Acid ◽  
Relative Standard ◽  
Total Variability ◽  
Liquid Chromatographic Determination ◽  
Predicted Values ◽  
Liquid Chromatographic

Abstract A new method for determination of glyphosate and amlnomethylphosphonlc acid (AMPA) residues In environmental water was collaboratively studied by 6 laboratories. The method Is simpler and shorter than previous methods. A filtered volume of water is evaporated to dryness and the residue Is dissolved In a buffered EDTA solution. Glyphosate and AMPA are determined by liquid chromatography with postcolumn reaction detection. The method was validated over the range 0.50-5000 ppb, although one of the collaborating laboratories could not reliably quantltate below 1.0 ppb. Statistical analysis of the results showed that typical reproducibility relative standard deviations (RSDR) ranged from 11 to 20% for both glyphosate and AMPA, which compares very well with predicted values for this concentration range. Total variability (as measured by sR) Increased with increasing fortification level. The method has been adopted official first action by AOAC.

Liquid Chromatographic Determination of Quinine, Hydroquinine, Saccharin, and Sodium Benzoate in Quinine Beverages

1985 ◽  
Vol 68 (4) ◽  
pp. 782-784
Author(s):  
Leonard P Valenti
Keyword(s):  
Sodium Benzoate ◽  
Direct Injection ◽  
Chromatographic Determination ◽  
Peak Height ◽  
Relative Standard ◽  
Sodium Saccharin ◽  
Liquid Chromatographic Determination ◽  
Liquid Chromatographic ◽  
The Relationship

Abstract A liquid chromatographic (LC) method is described for the determination of quinine, hydroquinine, sodium saccharin, and sodium benzoate in soft drinks. The method involves simple sample preparation, direct injection onto an octadecylsilane column, and elution with a methanol-acetonitrile-water-acetic acid (20 + 10 + 70 + 1) mobile phase. Eluted constituents are measured spectrophotometrically at 254 nm. The relationship between peak height and concentration was linear between 20 and 120 μg/mL for quinine. A relative standard deviation of 0.82% was obtained for commercial samples spiked with quinine, and the average recovery was 100.3%. The proposed procedure is accurate and rapid and can also detect hydroquinine (a natural contaminant of quinine), sodium saccharin, and sodium benzoate. Linear responses ranged from 0.45 to 20 (xg/mL for hydroquinine, from 54.8 to 219 μg/mL for sodium saccharin, and from 10.1 to 145.1 (ig/mL for sodium benzoate. The reproducibility of the LC method was evaluated with standard solutions of hydroquinine, sodium saccharin, and sodium benzoate, which produced relative standard deviations of 0.42, 0.46, and 1.13%, respectively. The average recoveries for sodium saccharin and sodium benzoate from spiked samples were 99.4 and 100.2%, respectively.

scholarly journals Liquid Chromatographic Determination of α-Solasonine in Frozen Green Peas as an Indicator of the Presence of Nightshade Berries

2003 ◽  
Vol 86 (4) ◽  
pp. 759-763 ◽  
Author(s):  
Peter Cavlovic ◽  
Mohan Mankotia ◽  
Peter Pantazopoulos ◽  
Peter M Scott
Keyword(s):  
Limit Of Detection ◽  
Chromatographic Determination ◽  
Solanum Nigrum ◽  
Expanded Uncertainty ◽  
Method Performance ◽  
Limit Of Quantitation ◽  
Liquid Chromatographic Determination ◽  
Liquid Chromatographic ◽  
Green Peas

Abstract Nightshade berries containing glycoalkaloids can be a contaminant in green peas. Methodology was developed to detect this contamination. The glycoalkaloid α-solasonine was extracted from frozen green peas with 1% (v/v) acetic acid, cleaned up on a C18 cartridge, and determined by liquid chromatography with UV detection at 200 nm. Method performance characteristics for the determination of α-solasonine include linearity from 140 to 1500 ng injected (r = 0.9996–0.9999); recovery ranging from 68 to 79%; limit of quantitation (LOQ) = 4.5 ppm (280 ng standard), and limit of detection = 0.64 ppm (40 ng standard). At the LOQ, the expanded uncertainty at 95% confidence was 0.38 × the reported value. The method was applied to the detection of α-solasonine in frozen green peas in a 2-year study of 60 samples of frozen green peas from Ontario, Canada. None of the samples contained α-solasonine. No unripe berries of Solanum nigrum were detected visually in the samples.

Liquid Chromatographic Determination of Carminic Acid in Yogurt

1989 ◽  
Vol 72 (2) ◽  
pp. 231-234 ◽  
Author(s):  
Mercedes Jalón ◽  
Majesús Peńa ◽  
Julián C Rivas
Keyword(s):  
Chromatographic Determination ◽  
Carminic Acid ◽  
Reverse Phase ◽  
Liquid Chromatographic Method ◽  
Relative Standard ◽  
Array Detection ◽  
Liquid Chromatographic Determination ◽  
Phase Liquid ◽  
Liquid Chromatographic

Abstract A reverse-phase liquid chromatographic method is described for the determination of carminic acid in yogurt. A C18 column is used with acetonitrile-1.19M formic acid (19 + 81) as mobile phase and diode array detection. Sample preparation includes deproteinization with papain and purification in a polyamide column. The relative standard deviation for repeated determinations of carminic acid in a commercial strawberry-flavored yogurt was 3.0%. Recoveries of carminic acid added to a natural-flavored yogurt ranged from 87.2 to 95.3% with a mean of 90.2%. The method permits measurement of amounts as low as 0.10 mg/kg.

Gas-Liquid Chromatographic Determination of Total Inorganic Iodine in Milk

1977 ◽  
Vol 60 (6) ◽  
pp. 1307-1309 ◽  
Author(s):  
Hendrik J Bakker
Keyword(s):  
Liquid Chromatography ◽  
Iodine Content ◽  
Chromatographic Determination ◽  
Electron Capture Detection ◽  
Gas Liquid Chromatography ◽  
Relative Standard ◽  
Liquid Chromatographic Determination ◽  
Inorganic Iodine ◽  
Liquid Chromatographic

Abstract Total inorganic iodine in milk is determined by conversion to iodobutanone, which is quantitated by gas-liquid chromatography and electron capture detection. As little as 10 μg/L can be determined. The thyroid-active iodine content of milk can be determined rapidly with a relative standard deviation of 1.9%. Average recoveries for added iodide and iodine were 95.5 and 94.6%, respectively.

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