scholarly journals Development of an In Situ Analyzer Based on Sequential Injection Analysis and Liquid Waveguide Capillary Flow Cell for the Determination of Dissolved Reactive Phosphorus in Natural Waters

Sensors ◽  
2020 ◽  
Vol 20 (10) ◽  
pp. 2967
Author(s):  
Zeming Yang ◽  
Cai Li ◽  
Zhenzhao Zhang ◽  
Guixin Lu ◽  
Zifeng Cai ◽  
...  
Keyword(s):  
Natural Waters ◽  
Capillary Flow ◽  
Northern South China Sea ◽  
River Estuary ◽  
Chemical Separation ◽  
Flow Cell ◽  
Injection System ◽  
Sequential Injection Analysis ◽  
Sequential Injection

This study presents an innovative technique for the in situ analysis of aquatic biochemical elements detected through wet chemical processes. A new compact in situ phosphate analyzer based on sequential injection analysis, liquid waveguide capillary flow cell and spectrophotometry was developed, and a safe and modular electronics-chemical separation mechanical structure was designed. The sequential injection system of this analyzer was optimized, and the major functions of this analyzer were studied and estimated. With a 10 cm liquid waveguide capillary flow cell and a 6.3 min time cost of detection, the analyzer reaches a detection limit of 1.4 μg·L−1 (≈14.7 nM, [PO43−]) and a consumption of 23 μL at most for each reagent. This analyzer was operated in situ and online during two scientific research cruises in the Pearl River Estuary and northern South China Sea. The advantages of this analyzer include its simple versatile manifold, full automation, low chemical consumption and electronics-chemical separate safe structure. Long-term in situ performance of this analyzer will be validated in the future.

scholarly journals Sequential Injection System for Analysis of Degree Brix, Orthophosphate and pH in Raw Sugarcane Juice Applicable to Sugar Industry

Molecules ◽  
2021 ◽  
Vol 26 (21) ◽  
pp. 6484
Author(s):  
Phoonthawee Saetear ◽  
Nattinee Saechua ◽  
Kamonthip Sereenonchai
Keyword(s):  
Field Effect Transistors ◽  
Sugar Industry ◽  
Sugarcane Juice ◽  
Injection System ◽  
Sequential Injection Analysis ◽  
Ph Sensing ◽  
Sequential Injection ◽  
Linear Calibration ◽  
Molybdenum Blue ◽  
Cane Juice

This work presents, for the first time, a new sequential injection analysis (SIA) method to simultaneously analyze degree Brix, orthophosphate and pH in raw cane juice. These key parameters relate to price of harvested sugarcane and quality of cane juice for sugar production. The SIA system employed two detectors: the first detector is a diode-array spectrophotometer, equipped with a regular flow cell, for measurements of degree Brix and orthophosphate. Quantitative of degree Brix (°Bx; ca. % (w/w) sucrose) was based on manipulation of the schlieren effect at the interface between plugs of sample and water. Orthophosphate analysis was carried out based on the molybdenum blue method with significant reduction in consumption of the reagents. Compensation of the schlieren effect from sucrose for determination of orthophosphate was achieved by using a dual-wavelength spectrometric detection. Second detector is a pH-sensing device, called ion-selective field-effect transistors (ISFET). The ISFET is based on the current through the ISFET arising according to the H+ concentration in solution. Our developed SIA system provides linear calibration graphs fitting for purpose in analysis of sugarcane juice (pH: 0–14, °Bx: 1.0–7.0 and P2O5: 20–200 mg L−1). Simultaneous analysis of sugarcane juice for pH, °Bx and P2O5 is carried out within 5 min (12 sample per h). Precision of SIA system is acceptable (RSD < 3%). Our SIA system gave quantitative results insignificantly different, as compared with conventional methods for analysis of pH, °Bx and P2O5 in sugarcane juice.

Highly reproducible SERS detection in sequential injection analysis: Real time preparation and application of photo-reduced silver substrate in a moving flow-cell

Talanta ◽  
2013 ◽  
Vol 116 ◽  
pp. 972-977 ◽  
Author(s):  
Marwa R. EL-Zahry ◽  
Andreas Genner ◽  
Ibrahim H. Refaat ◽  
Horria A. Mohamed ◽  
Bernhard Lendl
Keyword(s):  
Real Time ◽  
Flow Cell ◽  
Sequential Injection Analysis ◽  
Sequential Injection ◽  
Silver Substrate ◽  
Sers Detection

scholarly journals Sequential Injection Analysis for Automation and Evaluation of Drug Liberation Profiles: Clotrimazole Liberation Monitoring

Molecules ◽  
2021 ◽  
Vol 26 (18) ◽  
pp. 5538
Author(s):  
Hana Sklenářová ◽  
Marek Beran ◽  
Lucie Novosvětská ◽  
Daniela Šmejkalová ◽  
Petr Solich
Keyword(s):  
Steady State ◽  
Initial Rate ◽  
Injection System ◽  
Sequential Injection Analysis ◽  
Sequential Injection ◽  
Short Term ◽  
Simplified Approach ◽  
Steady State Flux ◽  
Sampling Intervals ◽  
First Time

A fully automated sequential injection system was tested in terms of its application in liberation testing, and capabilities and limitations were discussed for clotrimazole liberation from three semisolid formulations. An evaluation based on kinetic profiles obtained in short and longer sampling intervals and steady-state flux values were applied as traditional methods. The obtained clotrimazole liberation profile was faster in the case of Delcore and slower for Clotrimazol AL and Canesten cream commercial formulations. The steady-state flux values for the tested formulations were 52 µg cm−2 h−1 for Canesten, 35 µg cm−2 h−1 for Clotrimazol AL, and 7.2 µg cm−2 h−1 for Delcore measured in 4 min sampling intervals. A simplified approach for the evaluation of the initial rate based on the gradient between the second and third sampling points was used for the first time and was found to correspond well with the results of the conventional methods. A comparison based on the ratio of the steady-state flux and the initial rate values for Canesten and Clotrimazol AL proved the similarity of the obtained results. The proposed alternative was successfully implemented for the comparison of short-term kinetic profiles. Consequently, a faster and simpler approach for dissolution/liberation testing can be used.

scholarly journals Iron speciation in natural waters by sequential injection analysis with a hexadentate 3-hydroxy-4-pyridinone chelator as chromogenic agent

Talanta ◽  
2016 ◽  
Vol 148 ◽  
pp. 633-640 ◽  
Author(s):  
Joana L.A. Miranda ◽  
Raquel B.R. Mesquita ◽  
Ana Nunes ◽  
Maria Rangel ◽  
António O.S.S. Rangel
Keyword(s):  
Natural Waters ◽  
Sequential Injection Analysis ◽  
Sequential Injection ◽  
Iron Speciation ◽  
Chromogenic Agent
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