The invention provides a paper-based micro-fluidic
chip with a multi-channel heavy
metal ion detection function. The paper-based micro-fluidic
chip is composed of a first layer of paper substrate, a second layer of paper substrate, a third layer of paper substrate and a bottom layer supporting substrate, and is characterized in that the
chip is round or rectangular, and the three
layers of paper substrates which are consistent in shape and size and are subjected to hydrophobic treatment are pasted together. The chip is provided with a color
developing tank, a gradient channel, a reaction tank,a
reagent channel, a
reagent port, a sample port, a filter tank, a diversion tank, a diversion channel and a filtrate mutual channel with specific shapes and sizes. According to the chip, various functional components are arranged in a star shape by taking the sample port as a center. Or the sample port and the
reagent port are taken as the center separately, and a left center and a right centerare formed, and the other functional components are arranged in the middle of the sample port and the reagent port. The paper-based micro-fluidic chip has the beneficial effects that the chip is disposable, the material adopts the low-price degradable
filter paper, and the chip is environment-friendly and
pollution-free, so that secondary damage to the environment is avoided; and continuous, real-time and
rapid detection of heavy
metal ions can be realized for
environmental monitoring.