5 results about "Workplace air" patented technology

The application discloses a method for determining tin and inorganic compounds thereof in workplace air. The method comprises the following steps: firstly, using a microporous filter membrane to sample the workplace air; then, using a disposable PP polypropylene digestion tube, a digestion solution and a graphite digestion instrument to digest the microporous filter membrane after sampling; taking down the cooled microporous filter membrane and quantitatively placing it into a test tube by using a hydrochloric acid solution; adjusting the Ph value by using a sodium hydroxide solution and setting the volume to 25.0 mL; preparing a tin standard solution series and drawing a fluorescence intensity-tin content curve by using an atomic fluorescence spectrometer; analyzing the sample by using the atomic fluorescence spectrometer; the sample fluorescence intensity is proportional to the tin content; and obtaining the corresponding tin content from the fluorescence intensity of the sample according to the drawn fluorescence intensity-tin content curve. The method realizes the analysis and determination of trace, ultratrace tin and inorganic compounds thereof, reduces the instability of blank filter membranes caused by external interference, avoids the phenomenon that the blank filter membrane concentration is opposite to the sample concentration, and improves the determination precision.

This utility model discloses a material guide trough for easy dust removal, relating to the field of dust removal and material conveying technology. The utility model includes a base plate, with a transmitter fixedly connected to the top outer wall of the base plate. A dust removal mechanism is provided on the top outer wall of the transmitter, including the material guide trough. This utility model incorporates a curved pipe. When the vacuum cleaner starts operating, the generated suction is transmitted through the transmission pipe into the curved pipe, and then through the curved pipe into the dust collection hood. The dust collection hood then sucks up the dust generated by the material being poured. The sucked-up dust then passes through the curved pipe and the transmission pipe back into the vacuum cleaner, and finally falls into a dust collection box for storage, facilitating subsequent unified cleaning of the collected dust. This achieves the effect of easy dust removal, effectively reducing dust emissions during material conveying, lowering the dust content in the workplace air, and improving the air quality of the workshop.

The utility model relates to the technical field of environment detection, and discloses a workplace air environment detection device which comprises a telescopic rod and a fixing mechanism, the fixing mechanism comprises a fixing plate, an insertion hole is formed in the upper end face of the fixing plate, and a trapezoidal sliding block is fixedly arranged at the position, close to the telescopic rod, in the insertion hole. A main rod is movably arranged in the insertion hole; a trapezoid sliding groove is formed in the center of the side, close to the telescopic rod, of the main rod, a top plate is fixedly arranged at the upper end of the main rod, an elastic clamping head is fixedly arranged on the side, away from the trapezoid sliding groove, of the lower end of the top plate, a limiting ring fixedly sleeves the position, close to the lower end, of a rod body of the main rod, and a powerful suction cup is hinged to the lower end of the main rod. According to the utility model, through the diversified fixing modes, the simple operation process and the stable structural design, the problems of poor equipment adaptability, unstable fixation and the like in the prior art are effectively solved, and the device has wide application prospects and remarkable technical advantages.

The utility model discloses a continuous flow analysis system for hydrogen sulfide in air in a workplace, and relates to the technical field of hydrogen sulfide analysis. The continuous flow analysis system for the hydrogen sulfide in the air of the workplace comprises a gas-liquid driving module, a chemical reaction module, an optical detection module and an analysis module. The driving module comprises a sample injector, a sampling needle, a peristaltic pump and a plurality of conveying pipes; the sample injector is connected with the peristaltic pump through the sampling needle, and the delivery pump is connected with the reaction module; a gas injector, an on-line mixer, a three-way joint and an on-line waste gas discharger are arranged in the reaction module; the detection module is used for measuring the absorption of light with specific wavelength by the colored compound on the basis of a light absorption principle and converting a light signal into an electric signal; the analysis module receives the electric signal and processes data to calculate the hydrogen sulfide content. The utility model aims to realize efficient and accurate hydrogen sulfide detection.

The invention discloses a method for detecting a nitrogen oxide sample in air in a workplace, which comprises the following steps: mixing an air sample in a detection area with an absorbent to obtain a sample absorption liquid; mixing the sample absorption liquid with p-aminobenzoic acid to obtain a diazonium salt solution; carrying out an azo reaction on the diazonium salt solution, a sodium carbonate aqueous solution and an N-(1-naphthyl) ethylenediamine aqueous solution in a reaction bottle to obtain an azo reaction solution; detecting the azo reaction liquid to obtain a basic value of nitrogen oxide in the air sample; according to the basic value of the nitric oxide and the correction model of the nitric oxide, multiple groups of test values of the nitric oxide are obtained; obtaining geographical location information of the detection area, and based on the geographical location information, obtaining a detection average value of nitrogen oxides at corresponding positions and altitudes within a preset time range; and performing calculation and matching according to the multiple groups of test values and the detection average value of the nitrogen oxides in the air sample to remove individual deviated test values so as to obtain the concentration value of the nitrogen oxides in the air in the detection area.