Detection of Tricresyl Phosphates and Determination of Tri-o-Cresyl Phosphate in Edible Oils

1985 ◽  
Vol 68 (6) ◽  
pp. 1074-1076
Author(s):  
Mahishi N Krishnamurthy ◽  
S Rajalakshmi ◽  
Om Prakash Kapur
Keyword(s):  
Gas Chromatography ◽  
Thin Layer ◽  
Stationary Phase ◽  
Ethyl Acetate ◽  
Edible Oils ◽  
Flame Ionization Detection ◽  
Tricresyl Phosphate ◽  
Flame Ionization ◽  
Layer Chromatography

Abstract Tricresyl phosphate (TCP) in contaminated edible oils was extracted using acetonitrile and detected by thin layer chromatography as well as gas chromatography (GC). The chromatoplate was developed with isooctane-ethyl acetate (90 + 10) and visualized by spraying with 2,6- dichloroquinone chloroimide. TCP gives a characteristic blue-violet spot when heated at 100°C for 15 min. The method is direct and sensitive and can be used to detect as low as 2.5 p.g TCP or TOCP (tri-o-cresyl phosphate). GC was carried out using 10% OV-101 as the stationary phase and flame ionization detection for confirmation and quantitation of TOCP in oils.

Analytical Methods for the Fungicide ∝,∝-bis(p-Chlorophenyl)-3-Pyridinemethanol

1970 ◽  
Vol 53 (4) ◽  
pp. 747-755
Author(s):  
E W Day ◽  
O D Decker ◽  
J R Koons ◽  
F J Holzer
Keyword(s):  
Gas Chromatography ◽  
Thin Layer ◽  
Electron Affinity ◽  
Plant Tissues ◽  
Flame Ionization Detection ◽  
Absorbance Maximum ◽  
Flame Ionization ◽  
Highly Sensitive ◽  
Layer Chromatography

Abstract Methods are described for the identification and determination of parinol in formulations, soils, and plant tissues. Gas chromatography on a column of 1.5% OV-17 at 230°C is the most generally applicable technique. Flame ionization detection is employed for macro amounts of parinol and electron affinity for trace quantities. However, an intensely red halochromic salt formed when parinol is dissolved in H2SO4 is the basis for a highly sensitive and selective spectrophotometric procedure. The absorbance maximum at 520 nm obeys Beer’s Law in the 0.5-5.0 μg/ml range. Comparisons of these 2 methods are made for macro quantities of parinol. An alternative residue procedure is suggested which utilizes thin layer chromatography with visualization after H2SO4 spray. Residue data in soils and fruits are reported.

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