Determination of dopamine in the presence of ascorbic acid by poly(styrene sulfonic acid) sodium salt/single-wall carbon nanotube film modified glassy carbon electrode

2006 ◽  
Vol 350 (2) ◽  
pp. 285-291 ◽  
Author(s):  
Yuzhong Zhang ◽  
Yuejuan Cai ◽  
Shao Su
Keyword(s):  
Ascorbic Acid ◽  
Carbon Nanotube ◽  
Sodium Salt ◽  
Sulfonic Acid ◽  
Carbon Electrode ◽  
Modified Glassy Carbon Electrode ◽  
Acid Sodium Salt ◽  
Styrene Sulfonic Acid ◽  
Sulfonic Acid Sodium Salt

Flow injection spectrophotometric determination of iron(III) using diphenylamine-4-sulfonic acid sodium salt

2008 ◽  
Vol 62 (4) ◽  
Author(s):  
Adem Asan ◽  
Muberra Andac ◽  
Ibrahim Isildak ◽  
Nihat Tinkilic
Keyword(s):  
Flow Injection ◽  
Sodium Salt ◽  
Sulfonic Acid ◽  
Low Cost ◽  
Standard Addition ◽  
Acid Sodium Salt ◽  
Highly Sensitive ◽  
Relative Standard ◽  
Sulfonic Acid Sodium Salt

AbstractA highly sensitive and very simple spectrophotometric flow-injection analysis (FIA) method for the determination of iron(III) at low concentration levels is presented. The method is based on the measurement of absorbance intensity of the red complex at 410 nm formed by iron(III) and diphenylamine-4-sulfonic acid sodium salt (DPA-4-SA). It is a simple, highly sensitive, fast, and low cost alternative method using the color developing reagent DPA-4-SA in acetate buffer at pH 5.50 and the flow-rate of 1 mL min−1 with the sample throughput of 60 h−1. The method provided a linear determination range between 5 μg L−1 and 200 μg L−1 with the detection limit (3S) of 1 μg L−1 of iron(III) using the injection volume of 20 μL. FIA variables influencing the system performance were optimized. The amount of iron(III) and total iron in river and seawater samples was successfully determined. Repeatability of the measurements was satisfactory at the relative standard deviation of 3.5 % for 5 determinations of 10 μg L−1 iron(III). The accuracy of the method was evaluated using the standard addition method and checked by the analysis of the certified material Std Zn/Al/Cu 43 XZ3F.

1,2-Naphthoquinone-4-sulfonic acid sodium salt as a reagent for spectrophotometric determination of rimantadine and memantine

2015 ◽  
Vol 70 (3) ◽  
pp. 320-327 ◽  
Author(s):  
I. Muszalska ◽  
A. Sobczak ◽  
I. Kiaszewicz ◽  
K. Rabiega ◽  
M. A. Lesniewska ◽  
...  
Keyword(s):  
Spectrophotometric Determination ◽  
Sodium Salt ◽  
Sulfonic Acid ◽  
Acid Sodium Salt ◽  
Sulfonic Acid Sodium Salt
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