scholarly journals IONOMETRICAL DETERMINATION OF IRON (III) IN VEGETABLES AND FRUITS

2018 ◽  
Vol 59 (3) ◽  
pp. 22
Author(s):  
Yulia Ivanovna Matyushkina ◽  
Alexandr Alexandrovich Shabarin ◽  
Olga Petrovna Lazareva
Keyword(s):  
Fruit And Vegetables ◽  
Electrode Function ◽  
Nernst Equation ◽  
Mixed Solutions ◽  
Ionometric Determination ◽  
Vegetables And Fruits

The ability of iron (III) ionometric determination in a form of its thiosulfate complex was shown. Conditions of analysis were optimized. The obtained anionic electrode function E=f(pCFe(III) obeys to the Nernst equation in the range of 2.0 to 5.0 unit of MS and has a slope equals to 56±2 mV/pC. The determination selectivity in the presence of a number of cations and anions was studied by the “mixed” solutions method. The method was applied for the analysis of iron (III) content in some fruit and vegetables.

A New Volumetric Method for the Estimation of Sodium

1930 ◽  
Vol 20 (4) ◽  
pp. 511-516 ◽  
Author(s):  
A. Blenkinsop
Keyword(s):  
Sodium Acetate ◽  
Volumetric Method ◽  
Chemical Reagents ◽  
Mixed Solutions ◽  
Calcium Magnesium

1. A volumetric method for the determination of sodium which can be separated as a triple salt (uranium zinc sodium acetate) from mixed solutions is described. The reduction of the uranium with titanous chloride, upon which it depends is shown to be quantitative.2. Calcium, magnesium, and relatively large proportions of potash do not interfere. The procedure for the removal of iron, aluminium and phosphates by gentle ignition is simple and obviates the risk of error by the introduction of sodium as an impurity in the chemical reagents necessary for precipitation methods.3. 0.1 mg. of sodium can be determined accurately.

scholarly journals Improved Method for Determination of Total Mercury and Its Application to Vegetables and Fruits in Markets

1992 ◽  
Vol 33 (4) ◽  
pp. 359-364_1 ◽  
Author(s):  
Takeshi TANAKA ◽  
Yoshinari AOKI ◽  
Kikuo TAMASE ◽  
Fumiaki UMOTO ◽  
Hideyuki OHBAYASHI ◽  
...  
Keyword(s):  
Total Mercury ◽  
Improved Method ◽  
Vegetables And Fruits

Determination of 12 Carbamate Insecticides in Typical Vegetables and Fruits by Rapid Multi-Plug Filtration Cleanup and Ultra-Performance Liquid Chromatography/Tandem Mass Spectrometry Detection

2019 ◽  
Vol 58 (2) ◽  
pp. 109-116
Author(s):  
Lili Ma ◽  
Liuwei Zhao ◽  
Jiaqi Wang ◽  
Canping Pan ◽  
Cong Liu ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Liquid Chromatography ◽  
Tandem Mass Spectrometry ◽  
Matrix Effects ◽  
Solid Phase ◽  
Ultra Performance Liquid Chromatography ◽  
Tandem Mass ◽  
Liquid Chromatography Tandem Mass ◽  
Vegetables And Fruits

Abstract A multiresidue method for determining 12 carbamate pesticides in purple cabbage, orange, watermelon, cucumber, cowpea and Lactuca sativa L. employing multi-plug filtration cleanup (m-PFC) and ultra-performance liquid chromatography coupled with electrospray ionization tandem mass spectrometry (UPLC-ESI-MS/MS) was developed. M-PFC was carried out by cleanup at dispersive solid phase extraction (d-SPE), one m-PFC tip-filtration, two m-PFC tip-filtration and other methods (1–3 m-PFC cleanups). Results demonstrated that filtration simplified the cleanup method compared with d-SPE and other m-PFC methods (1–3 m-PFC cleanups). The method validation results showed that the method was linear, selective and accurate. The limits of quantification (LOQs) were 0.05–5.0 μg/kg, and the recoveries were in the range of 70.1–119.9% in different matrices. Although matrix effects were observed, they were successfully compensated using matrix-matched calibration. Finally, the developed method was successfully applied to detect pesticides in real samples.

scholarly journals Determination of Imidacloprid and Benzimidazole Residues in Fruits and Vegetables by Liquid Chromatography–Mass Spectrometry after Ethyl Acetate Multiresidue Extraction

2000 ◽  
Vol 83 (3) ◽  
pp. 748-755 ◽  
Author(s):  
Amadeo R Fernández-Alba ◽  
Ana Tejedor ◽  
Ana Agüera ◽  
Mariano Contreras ◽  
Juan Garrido
Keyword(s):  
Mass Spectrometry ◽  
Liquid Chromatography ◽  
Ethyl Acetate ◽  
Fruits And Vegetables ◽  
Monitoring Program ◽  
Reversed Phase ◽  
Food Samples ◽  
Ionization Mass ◽  
Vegetables And Fruits

Abstract A simple and sensitive method based on liquid chromatography–atmospheric pressure ionization–mass spectrometry is described for the determination of 4 benzimidazole pesticides (carbendazim, thiabendazole, benomyl, and thiophanate-methyl) and imidacloprid in vegetables and fruits. Food samples were typically extracted with ethyl acetate to draw the analytes into the organic phase. No cleanup step was necessary before injection into the liquid chromatographic (LC) system with electrospray mass spectrometric detection. The analytes were separated on a reversed-phase C8LC column. Limits of detection for the compounds were in the μg/L range. Results are reported for validation studies with fortified pear and tomato samples and for residues of the target compounds found in the pesticide residue monitoring program during 1998.

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