90 results about "Permanganate index" patented technology

The invention discloses a permanganate index on-line monitoring automatic titration determination method and device; based on an automatic measurement flow, an end point is jointly determined with cooperation of two ways of absorbance and electric potentials, and the relationships of the changes of the solution absorbance and the electric potentials with the titration volume are simultaneously used in the titration determination method, staging and selective design is performed for the entire titration process, and different titration speeds are adopted in different titration stages so as to ensure the accuracy of the titration. Two conditions of the absorbance and the electric potentials are used at the same time; when the solution not only meets conditions of photometric determination ofthe end point but also meets the conditions of electrode determination of the end point during automatic titration, the titration is determined to reach the end point; through a specific titration algorithm and the determination way, the method and device solve the problems that the electric potential generates aging and drifting because a traditional photometric method is interfered by water colors, turbidity and other factors and an ORP electrode is used for a long time.

The invention provides an acid and alkali permanganate index on-line one-machine monitoring system and the detection method thereof. The acid and alkali permanganate index on-line one-machine monitoring system includes an ARM9 main-control system, a permanganate index on-line monitoring instrument and a chloride ion concentration measuring instrument, wherein the ARM9 main-control system is connected with the permanganate index on-line monitoring instrument and the chloride ion concentration measuring instrument through a CAN bus respectively; the permanganate index on-line monitoring instrument includes a peristaltic pump, a measuring cup, a liquid level detector, a ten-port multi-position valve, a digestion titration device, a water sample, a reagent and distilled water; the water sample, the reagent and the distilled water are connected with distribution ports of the ten-port multi-position valve respectively; the lower end of the measuring cup is connected with a common port of the ten-port multi-position valve; the peristaltic pump is connected with the upper end of the measuring cup through a pipeline; the liquid level detector is installed at the upper part of the measuring cup; and one distribution port of the ten-port multi-position valve respectively is connected with a liquid inlet / outlet of the digestion titration device. Considering the economy and environmental protection, the invention provides a technical device for measuring the permanganate index through integrating the two standard acid and alkali permanganate index methods.

The invention discloses a river water quality evaluation method based on multiple parameter indexes. According to the method, river water quality is evaluated and graded on the basis of a WQI (water quality index) and with WQImin as an index. The fact that WQImin containing NH4-N, CODMn, NO3-N, DO (dissolved oxygen) and tur (turbidity) is in significant positive correlation with the WQI is discovered, so that WQImin containing NH4-N, CODMn, NO3-N, DO and tur can be adopted to constitute WQImin to replace the original WQI obtained by calculating numerous parameters required to be determined, and rapid evaluation and type classification of river water quality can be realized. The method is simple and easy to operate, low in cost and easy to popularize and has quite obvious advantages.

The invention proposes a permanganate index analyzer and a permanganate index analysis method, including a base, a controller, a sample area to be tested, a water bath heating and digestion area, and a heat preservation titration area. There are multiple sets of water bath heating modules in the water bath heating and digestion area. The water bath heating modules are connected to the controller by communication. The thermal insulation titration area includes a drop positioning and thermal insulation module. A magnetic stirrer and thermal insulation module are installed under each drop positioning. , The magnetic stirrer communicates with the controller; the base is provided with a first mechanical arm and a second mechanical arm, the second mechanical arm is provided with a color sensing element and a liquid addition titration assembly, the titration assembly, the color sensing element, the first mechanical arm Both the second mechanical arm and the controller are connected in communication. The invention solves the problems of low precision and low efficiency existing in the index analysis of permanganate in the prior art.

The invention relates to a permanganate index type water quality analyzer, in particular to a permanganate index type water quality analyzer for determination of a titration endpoint in an ORP (oxidation-reduction potential) electrode method. In the titration endpoint determination method for the ORP value of the permanganate index type water quality analyzer, the maximum ORP_A of the ORP value is obtained in the first phase of each measurement, the minimum ORP_B of the ORP value is obtained in the second phase of the measurement, and ORP_K is calculated as the determined ORP value for the titration endpoint of the measurement through ORP_K = [(ORP_A) - (ORP_B)] * 30% + (ORP_B). Therefore, the ORP value for each titration endpoint is dynamically determined, errors in determination caused by ORP aging and drifting can be eliminated, and maintenance avoidance and accurate determination can be effectively achieved during the service life of the whole ORP electrode.

The invention discloses a portable gas-phase molecular absorption spectrometer, relates to the technical field of optical analysis, and aims to solve the problems that a detection device in the conventional gas-phase molecular absorption spectrometer is complicated in structure, complicated in operation and inconvenient to carry and cannot meet requirements on content determination of outdoor objects to be detected. The portable gas-phase molecular absorption spectrometer comprises a sampling device, a heating device, a gas liquid separation device, a drying device and the detection device, wherein the detection device comprises a sensor, a detector, a signal processing system, a control system and a read-out system, which are sequentially connected; and the sensor is positioned at a gas output port of the gas liquid separation device. The portable gas-phase molecular absorption spectrometer is particularly applicable to determination of ammonia nitrogen, sulfide, Kjeldahl nitrogen, total nitrogen, nitrate, nitrite, sulfite, chloride ions and permanganate index.