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Development of monitoring methods and instruments for marine environmental parameters
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Development of an integrated universal hardware and software platform for flow analysis instruments
P-SPS1-08-S
Jin Xu* , State Key Laboratory of Marine Environmental Science, College of the Environment and Ecology, Xiamen University
Kunning Lin, State Key Laboratory of Marine Environmental Science, College of the Environment and Ecology, Xiamen University
Yongming Huang, State Key Laboratory of Marine Environmental Science,Xiamen University
Xiaochang Zhang, School of Electronic Engineering and Automation, Guilin University of Electronic Technology
Dongxing Yuan,
Presenter Email: scxujin@stu.xmu.edu.cn |
| An integrated universal platform comprising multiple bearer sub-systems and multi-control interface has been developed for flow analysis. The platform employing a bus topology was based on distributed control system, and established with communication between main controller and PC using industrial standard communication protocol-MODBUS protocol. The platform could automatically complete the process of sample injection, reagent mixing, signal detection, data acquiring and analysis with upper-computer and lower-controller. The master control board, which embedded a 32-bit programmable ARM microcontroller, was designed to safely and reliably manage the actuation of mechanical devices (pump, injection valve, multi-position valve and solenoid valve) and synchronize data exchange between hardware sections with MODBUS. A PC program using LabVIEW was compiled for devices control, multi-wavelength signal processing, history data logging and human-machine interface. Both hardware and software components were built and tested to verify the normality of their functions.
An application example of the developed platform was a successfully control of a total phosphorus analyzer, which could automatically determine the concentration of organic phosphonate corrosion inhibitors in industrial circulating cooling water. Measurement of the organic polyphosphoric compounds was based on colorimetric method with vanadomolybdophosphoric acid, after being converted to orthophosphate with digesting agent of potassium persulfate and UV-photooxidation. The detection linear range was 0.2 - 50 mg/L, while the limit of detection was 0.05 mg/L. The recovery of several real samples at different concentrations was ranged from 91.5% to 103.8% and analytical result for total phosphorus of a certified reference material (GSBZ50033-95) was 1.50 ± 0.04 mg/L (n=3), which was basically agreed with the certified value (1.51 ± 0.02 mg/L).
The platform possessing the integrated software-hardware solution is extremely versatile in its sub-devices control capacity, and suitable for any new flow analysis instruments to be easily customized to fit the experimental design for various environmental water analysis.
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