Photometric Determination of Boron by Solvent Extraction Using Monomethylthionine

1960 ◽  
Vol 32 (11) ◽  
pp. 1530-1531 ◽  
Author(s):  
L. C. Pasztor ◽  
J. D. Bode
Keyword(s):  
Solvent Extraction ◽  
Photometric Determination

Extraction of Selected Organic Bases from Water into Chloroform by Means of the Cobaltacarborane Anion

1998 ◽  
Vol 63 (7) ◽  
pp. 967-976 ◽  
Author(s):  
Oldřich Navrátil ◽  
Zdeněk Skaličan ◽  
Zbyněk Kobliha ◽  
Emil Halámek
Keyword(s):  
Solvent Extraction ◽  
Aqueous Phase ◽  
Organic Nitrogen ◽  
Base Cations ◽  
Photometric Determination ◽  
Nitrogen Base ◽  
Organic Bases ◽  
Quaternary Salts ◽  
Extraction Constants

The cobaltacarborane anion labelled with 60Co was used to study the solvent extraction and stability of its ion associates with a series of organic nitrogen base cations or quaternary salts, some of which are psychoactive. The aqueous phase was 0.1 M HCl, the organic phase was chloroform. The extraction constants of the ion associates were calculated. A method was devised for competitive extraction of ion associates with additional dye anions which are used in the extraction-photometric determination of selected bases.

scholarly journals A Highly Sensitive Multicommuted Flow Analysis Procedure for Photometric Determination of Molybdenum in Plant Materials without a Solvent Extraction Step

2017 ◽  
Vol 2017 ◽  
pp. 1-8
Author(s):  
Felisberto G. Santos ◽  
Boaventura F. Reis
Keyword(s):  
Solvent Extraction ◽  
Sampling Rate ◽  
Flow Analysis ◽  
Reference Method ◽  
Photometric Determination ◽  
Plant Materials ◽  
Photometric Detection ◽  
Extraction Step ◽  
Highly Sensitive

A highly sensitive analytical procedure for photometric determination of molybdenum in plant materials was developed and validated. This procedure is based on the reaction of Mo(V) with thiocyanate ions (SCN−) in acidic medium to form a compound that can be monitored at 474 nm and was implemented employing a multicommuted flow analysis setup. Photometric detection was performed using an LED-based photometer coupled to a flow cell with a long optical path length (200 mm) to achieve high sensitivity, allowing Mo(V) determination at a level of μg L−1 without the use of an organic solvent extraction step. After optimization of operational conditions, samples of digested plant materials were analyzed employing the proposed procedure. The accuracy was assessed by comparing the obtained results with those of a reference method, with an agreement observed at 95% confidence level. In addition, a detection limit of 9.1 μg L−1, a linear response (r=0.9969) over the concentration range of 50–500 μg L−1, generation of only 3.75 mL of waste per determination, and a sampling rate of 51 determinations per hour were achieved.

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