New Method for the Determination of Benzoic and Sorbic Acids in Commercial Orange Juices Based on Second-Order Spectrophotometric Data Generated by a pH Gradient Flow Injection Technique

2004 ◽  
Vol 52 (9) ◽  
pp. 2479-2484 ◽  
Author(s):  
Nilda R. Marsili ◽  
Adriana Lista ◽  
Beatriz S. Fernandez Band ◽  
Héctor C. Goicoechea ◽  
Alejandro C. Olivieri
Keyword(s):  
Flow Injection ◽  
Gradient Flow ◽  
Second Order ◽  
Ph Gradient ◽  
New Method ◽  
Injection Technique ◽  
Spectrophotometric Data

Spectrophotometric determination of pKa values based on a pH gradient flow-injection system

2000 ◽  
Vol 408 (1-2) ◽  
pp. 135-143 ◽  
Author(s):  
Javier Saurina ◽  
Santiago Hernández-Cassou ◽  
Romà Tauler ◽  
Anna Izquierdo-Ridorsa
Keyword(s):  
Spectrophotometric Determination ◽  
Flow Injection ◽  
Gradient Flow ◽  
Ph Gradient ◽  
Injection System ◽  
Pka Values ◽  
Flow Injection System

New method for simultaneous determination of Fe(II) and Fe(III) in water using flow injection technique

2010 ◽  
Vol 668 (1) ◽  
pp. 8-12 ◽  
Author(s):  
J. Kozak ◽  
J. Gutowski ◽  
M. Kozak ◽  
M. Wieczorek ◽  
P. Kościelniak
Keyword(s):  
Simultaneous Determination ◽  
Flow Injection ◽  
New Method ◽  
Injection Technique

Sensitive flow-injection technique for the determination of dissolved organic carbon in natural and waste waters

1992 ◽  
Vol 261 (1-2) ◽  
pp. 287-294 ◽  
Author(s):  
R.T. Edwards ◽  
I.D. McKelvie ◽  
P.C. Ferrett ◽  
B.T. Hart ◽  
J.B. Bapat ◽  
...  
Keyword(s):  
Organic Carbon ◽  
Dissolved Organic Carbon ◽  
Flow Injection ◽  
Injection Technique ◽  
Waste Waters

Spectrophotometric determination of urinary iodine by flow-injection analysis with on-line catalytic digestion

1996 ◽  
Vol 42 (12) ◽  
pp. 2021-2027 ◽  
Author(s):  
Z Yaping ◽  
Y Dongxing ◽  
C Jixiang ◽  
L Tianshiu ◽  
C Huiqin
Keyword(s):  
Flow Injection ◽  
Reference Sample ◽  
Urinary Iodine ◽  
Iodine Concentration ◽  
Urine Samples ◽  
Injection Technique ◽  
Freeze Dried ◽  
On Line ◽  
Iodine In Urine

Abstract A flow-injection technique involving on-line catalytic digestion and spectrophotometric detection has been developed for the determination of iodine in urine. After urine samples are digested by KMnO4-K2Cr2O7-H2SO4 solution, the iodine in the urine catalyzes the reaction of As(III) with Ce(IV). The remaining Ce(IV) is then reacted with brucine and the product is detected with a spectrophotometer at 480 nm. With this technique, we obtained a detection limit for urinary iodine of 0.039 mumol/L, and the linear range was 0.039-7.88 mumol/L with a CV < 3%. Analytical recovery ranged between 92% and 104% (mean 99%). The sampling frequency of the flow-injection technique was 70/h. We applied the method to measure the iodine concentration in a freeze-dried urine reference sample and in collected urine samples, and compared the results with those obtained by the accepted alkaline ashing technique. The proposed technique has the advantages of being simple, rapid, precise, accurate, and sensitive. It can be used to assess iodine-deficient populations as well as those receiving treatment.

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