Research Article

Cloud Point Extraction for the Determination of Trace Amounts of Cobalt in Water and Food Samples by Flame Atomic Absorption Spectrometry

Table 4

Procedure using cloud point extraction prior to cobalt determination by FAAS.

ReagentSurfactantSample volume/mLEFaLODb/(μg L−1)Reference

Ammonium pyrrolidine dithiocarbamateTriton X-11410205[14]
1-(2-Thiazolylazo)-2-naphtholTriton X-11450570.24[15]
1-(2-Pyridylazo)-2-naphtholTriton X-114101150.38[16]
2-(5-Bromo-2-pyridylazo)-5-diethylaminophenolTriton X-10012.528.51.06 [17]
1-nitroso-2-naphtholPONPE 7.510271.22[18]
2-[2′-(6-Methyl-benzothiazolylazo)]-4-bromophenolTriton X-11410280.9[19]
Methyl-2-pyridylketone oximeTriton X-11415672.1[20]
2-[(2-Mercaptophenylimino)methl]phenolTriton X-11425970.21[21]
2-guanidinobenzimidazoleTriton X-11450137.8[22]
1-PhenylthiosemicarbazideTriton X-11450251[23]
4-Methoxy-2-sulfo-benzenediazoaminoazo-benzeneTriton X-11415190.47This work

aEnhancement factor, blimit of detection.