scholarly journals Sensitive and precise analytical methods for the determination of impurities in hydrometallurgical zinc refining by utilizing flow-injection technique.

1996 ◽  
Vol 45 (1) ◽  
pp. 1-18
Author(s):  
Yutaka HAYASHIBE ◽  
Yasumasa SAYAMA ◽  
Koichi OGUMA
Keyword(s):  
Flow Injection ◽  
Analytical Methods ◽  
Injection Technique ◽  
Determination Of Impurities

scholarly journals Rapid and Automated Analytical Methods for Redox Species Based on Potentiometric Flow Injection Analysis Using Potential Buffers

2011 ◽  
Vol 2011 ◽  
pp. 1-14 ◽  
Author(s):  
Hiroki Ohura ◽  
Toshihiko Imato
Keyword(s):  
Flow Injection ◽  
Analytical Methods ◽  
Injection Technique ◽  
Selective Electrode ◽  
Redox Species ◽  
Injection Method ◽  
Highly Sensitive ◽  
Bromide Ion ◽  
Oxidative Species

Two analytical methods, which prove the utility of a potentiometric flow injection technique for determining various redox species, based on the use of some redox potential buffers, are reviewed. The first is a potentiometric flow injection method in which a redox couple such as Fe(III)-Fe(II), Fe-Fe(CN), and bromide-bromine and a redox electrode or a combined platinum-bromide ion selective electrode are used. The analytical principle and advantages of the method are discussed, and several examples of its application are reported. Another example is a highly sensitive potentiometric flow injection method, in which a large transient potential change due to bromine or chlorine as an intermediate, generated during the reaction of the oxidative species with an Fe(III)-Fe(II) potential buffer containing bromide or chloride, is utilized. The analytical principle and details of the proposed method are described, and examples of several applications are described. The determination of trace amounts of hydrazine, based on the detection of a transient change in potential caused by the reaction with a Ce(IV)-Ce(III) potential buffer, is also described.

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.

Determination of Meclofenoxate Hydrochloride by Resonance Rayleigh Scattering Method Coupled with Flow Injection Technique

2010 ◽  
Vol 43 (13) ◽  
pp. 2125-2133 ◽  
Author(s):  
Xiaoli Hu ◽  
Dongpo Xu ◽  
Shaopu Liu ◽  
Zhongfang Liu ◽  
Cuixia Li ◽  
...  
Keyword(s):  
Flow Injection ◽  
Rayleigh Scattering ◽  
Resonance Rayleigh Scattering ◽  
Injection Technique ◽  
Scattering Method

Simultaneous Determination of Copper, Lead and Zinc in Alloy by Potentiometric Titration Coupled with Multivariate Calibration Using a Flow Injection Technique

2013 ◽  
Vol 785-786 ◽  
pp. 1353-1358 ◽  
Author(s):  
Chan Gai Deng ◽  
Li Fu Liao ◽  
Wei Long
Keyword(s):  
Simultaneous Determination ◽  
Potentiometric Titration ◽  
Flow Injection ◽  
Multivariate Calibration ◽  
Injection Technique ◽  
Lead And Zinc ◽  
Relative Standard ◽  
Determination Of Copper ◽  
Copper Lead

A new potentiometric titration method coupled with multivariate calibration using a flow injection technique for the simultaneous determination of multi-components in alloy has been developed. the titrant is a mixture of EDTA and sodium fluoride, both mercury film electrode and fluorinion selective electrode are inserted in the flow cell. In a process of titration, both the potentiometric of mercury ion and the mixed proportion of reactants at each titration point can be obtained simultaneously from the two electrodes, and then the concentration of each component in the mixture can be obtained from the titration curves by multivariate calibration method. The method is free of volumetric and time measurements, and reduces the consumption of reagents and samples. The method is also very quick in analysis rapidity. The method has been applied for the simultaneous determination of copper, lead and zinc in alloy samples with the relative standard deviation of 0.18%~0.45% and the recovery of 99.5%~101.6%.

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