Direct determination of phosphate in urine by sequential-injection analysis with single on-line dilution–calibration method and photometric detection

2004 ◽  
Vol 330 (2) ◽  
pp. 193-198 ◽  
Author(s):  
D.G. Themelis ◽  
A. Economou ◽  
A. Tsiomlektsis ◽  
P.D. Tzanavaras
Keyword(s):  
Direct Determination ◽  
Calibration Method ◽  
Sequential Injection Analysis ◽  
Sequential Injection ◽  
Photometric Detection ◽  
On Line

Sequential injection analysis coupled to on-line benchtop proton NMR: Method development and application to the determination of synthetic cathinones in seized drug samples

Talanta ◽  
2021 ◽  
Vol 231 ◽  
pp. 122355
Author(s):  
Timothy J. Trinklein ◽  
Malati Thapa ◽  
Lexie A. Lanphere ◽  
John A. Frost ◽  
Sandra M. Koresch ◽  
...  
Keyword(s):  
Method Development ◽  
Proton Nmr ◽  
Synthetic Cathinones ◽  
Sequential Injection Analysis ◽  
Sequential Injection ◽  
Nmr Method ◽  
On Line

scholarly journals A Simple Automated Method for the Determination of Nitrate and Nitrite in Infant Formula and Milk Powder Using Sequential Injection Analysis

2011 ◽  
Vol 2011 ◽  
pp. 1-7 ◽  
Author(s):  
Mariela Pistón ◽  
Alicia Mollo ◽  
Moisés Knochen
Keyword(s):  
Milk Powder ◽  
Sequential Injection Analysis ◽  
Sequential Injection ◽  
Liquid Form ◽  
Automated Method ◽  
Nitrate Determination ◽  
On Line ◽  
Nitrate And Nitrite ◽  
User Friendly

A fast and efficient automated method using a sequential injection analysis (SIA) system, based on the Griess, reaction was developed for the determination of nitrate and nitrite in infant formulas and milk powder. The system enables to mix a measured amount of sample (previously constituted in the liquid form and deproteinized) with the chromogenic reagent to produce a colored substance whose absorbance was recorded. For nitrate determination, an on-line prereduction step was added by passing the sample through a Cd minicolumn. The system was controlled from a PC by means of a user-friendly program. Figures of merit include linearity (r2> 0.999 for both analytes), limits of detection (0.32 mg kg-1NO3-N, and 0.05 mg kg-1NO2-N), and precision (sr%) 0.8–3.0. Results were statistically in good agreement with those obtained with the reference ISO-IDF method. The sampling frequency was 30 hour-1(nitrate) and 80 hour-1(nitrite) when performed separately.

scholarly journals Direct Determination of Molecular Weight and Its Distribution by the Absolute Calibration Method Using the On-Line GPC/NMR

1990 ◽  
Vol 22 (3) ◽  
pp. 218-222 ◽  
Author(s):  
Koichi Hatada ◽  
Koichi Ute ◽  
Masaharu Kashiyama ◽  
Mamoru Imanari
Keyword(s):  
Molecular Weight ◽  
Direct Determination ◽  
Calibration Method ◽  
Absolute Calibration ◽  
On Line ◽  
The Absolute
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