Aiming at the key problems of marine in-situ detection

an improvement solution is presented to overcome the weakness of current spectrophotometric detecting system.By selecting LEDs as light source and photodiodes and precise demodulating circuit as optical detector

combined with micro-flow pump valve and as well as small-volume flow cell

system noise

power and reagent consumption are reduced.A pH measurement experiment is designed to verify the performance of system.The results show that the system noise is less than 0.0005 and power consumption is less than 90mWh during an operating cycle and reagent consumption is only 0.75 mL

which satisfy the request of in-situ detection.