Liquid–liquid extraction as a sample preparation procedure for the determination of Na, K, Ca, and Mg in biodiesel

2017 ◽  
Vol 9 (36) ◽  
pp. 5395-5399 ◽  
Author(s):  
Ariane Isis Barros ◽  
Adriana Paiva de Oliveira ◽  
José Anchieta Gomes Neto ◽  
Ricardo Dalla Villa
Keyword(s):  
Sample Preparation ◽  
Liquid Extraction ◽  
Preparation Procedure ◽  
Liquid Liquid Extraction ◽  
Sample Preparation Procedure

Liquid–liquid extraction as a sample preparation procedure was employed for the determination of Na, K, Ca, and Mg in biodiesel by LS FAAS and Na and K by FP.

scholarly journals Comparison of two sample preparation procedures for HPLC determination of ochratoxin A

2009 ◽  
Vol 61 (4) ◽  
pp. 639-644 ◽  
Author(s):  
Gorica Vukovic ◽  
Snezana Pavlovic ◽  
M.S. Ristic
Keyword(s):  
Sample Preparation ◽  
Phosphoric Acid ◽  
Ochratoxin A ◽  
Chromatographic Determination ◽  
Liquid Extraction ◽  
Immunoaffinity Column ◽  
Maize Flour ◽  
Liquid Liquid Extraction ◽  
Immunoaffinity Columns

In preparation of samples for chromatographic determination of ochratoxin A, two types of columns were used for sample cleanup (SPE and immunoaffinity columns). The first method consisted of liquid-liquid extraction with a mixture of chloroform and phosphoric acid, followed by ion-exchange cleanup on Waters Oasis MAX columns. The sec?ond method consisted of extraction with a mixture of water and methanol, followed by LCTech OtaCLEAN immunoaf?finity column cleanup. Recoveries of the methods were determined at three levels in three repetitions for maize flour, and they were 84% (%RSD = 19.2) for the first method of sample preparation and 101% (%RSD = 2.2) for the second method. Values of LOQ for OTA were 0.25 and 1.00 ?g/kg for the IAC and SPE clean-up procedures, respectively. Both methods comply with present regulations, but the MAX sample clean-up procedure should be used as an alternative, since the immunoaffinity column clean-up procedure is characterized by better reproducibility, accuracy, and efficiency.

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