44 results about "Workplace air" patented technology

The invention belongs to the technical field of chemical measurement methods and in particular relates to a method for measuring acrylic acid in air in working spaces by using ion chromatography. The rapid, sensitive, accurate, environment-friendly and low-cost method for measuring acrylic acid in air in working spaces by using ion chromatography is constructed by collecting the acrylic acid through a silicone tube and by taking environment-friendly pollution-free sodium carbonate/sodium bicarbonate as desorption solution and chromatographic mobile phase. A novel feasible way is provided for rapidly and accurately measuring acrylic acid in air in the working spaces, and the application of the ion chromatography in occupational health inspection is widened.

The invention discloses a system for recovering the total heat of waste damp and hot air and a method for recovering the total heat of the waste damp and hot air. The system for recovering the total heat of the waste damp and hot air is used for high-temperate and high-humidity work environment which is relatively sealed. The system comprises a heat recovery machine set and heat usage equipment, wherein the heat recovery machine set comprises an evaporator arranged in a work environment, a condenser connected with the evaporator by one pipeline, and a compressor connected with the evaporator and the condenser by the other pipelines; the heat usage equipment comprises a water box connected with the condenser by a circulating pipeline, and water transporting equipment connected in a water outlet pipeline of the water box; and a water inlet pipe and the water outlet pipe which can be connected with a tap water pipeline, are further arranged on the water box. The system and the method can be used for effectively collecting the waste damp and hot air discharged in the work environment such as a hotel washhouse, a printing and dyeing mill and the like as well as recovering the total heat of the waste damp and hot air to heat up the tap water, so that the hot water can be provided to a washing flow path to use, and the effects of energy saving, consumption reducing, and air cooling and dehumidifying of a working space can be achieved.

The invention relates to a method for determining ethanol and isopropyl benzene contents of air and waste gas, and mainly aims to solve the problem that ethanol and isopropyl benzene cannot be sampled and analyzed at the same time in the air and the waste gas in the prior art. The method for determining ethanol and isopropyl benzene contents of the air and the waste gas comprises the following steps: (1) sampling with an activated carbon tube at a sampling point, immediately enclosing the two ends of the activated carbon tube after sampling, and waiting for determination; (2) opening the activated carbon tube collected in the step (1) during detection, pouring activated carbon into a solvent desorption bottle, and extracting upper-layer desorption solution for determination; (3) injecting the desorption solution obtained in the step (2) into a gas chromatograph, quantitatively analyzing under a certain chromatographic condition, and dividing a detection result by a sampling volume to obtain the concentrations of the ethanol and the isopropyl benzene in the air and the waste gas at a workplace. If the sample concentrations exceed a detection range, the problem is well solved by determination after dilution with the desorption solution. The method can be applied to determination of the ethanol and isopropyl benzene contents.

The invention discloses a method for detecting chloroacetic acid in air in a workplace. The method uses a silica gel sampling tube to collect chloroacetic acid, uses deionized water as stripping liquid, and uses an anion chromatographic column for assay determination, being a rapid, sensitive, accurate and low-cost method for detecting chloroacetic acid in the workplace with an ion chromatography. Thus, a new practical way is provided for detecting chloroacetic acid in air in the workplace, and the application of the ion chromatography to occupational health surveillance is widened.

The invention discloses a mechanical dust removal device which comprises a body, a first partition plate and an ash removal module. The mechanical dust removal device disclosed by the invention is reasonable in structural design and extremely high in practicality. During operation, workplace air is sucked into a body by a fan by virtue of an air suction pipe, bulk pollutants can be blocked on theside by the first partition plate, and then a motor drives a U-shaped rack to move up and down by virtue of an arc gear, so that the blocked pollutants are cleared in a dust collection box, the condition that the machine cannot effectively run due to blockage of the bulk pollutants is avoided, and continuity and high efficiency of dust removal can be effectively ensured. Dust pollutants can be rapidly and efficiently filtered under effects of a first filtering layer, a second filtering layer and a third filtering layer, and floating dust can be further efficiently treated by virtue of an atomized sprayer. Moreover, the air is humidified, the filtering net can be rapidly withdrawn and replaced by opening a rear cover plate, the water source is replaced, and the operation is convenient and rapid. The device is small and practical, the filtering net does not need to be frequently replaced, the dust removal efficiency is high, and the effect is excellent.

The invention relates to a method of determining content of methyl ethyl ketone peroxide in workplace air through UV spectrophotometer. The method comprises absorbing the methyl ethyl ketone peroxide in the air by using an absorption tube with fillers, putting the adsorbent into glacial acetic acid for analyzing, performing ultrasonic vibration, adding 4-isobutyl catechol for chromogenic reaction, and performing colorimetric determination at a wavelength of 395 nm through the spectrophotometer, wherein shades of colors is in direct proportion with concentrations of the methyl ethyl ketone peroxide. The method can eliminate interferences of styrene, acetone, dimethyl phthalate, etc. collected in the samples, and has a detection limit being up to 0.05 mg/m<3> and being far lower than a limit of 1.5 mg/m<3> required by American Government Industrial Hygienists (ACGIH). Therefore, the method provided by the invention provides a reliable and conveniently-implemented method for detecting the content of the methyl ethyl ketone peroxide in the workplace air, and can meet requirements of environmental monitoring, occupational health testing, and factory production.

The invention relates to a method for measuring total dust number concentration in air of a workplace. The method comprises steps as follows: collection of a dust sample: the dust sample is collected according to GBZ159-2004; preparation of a suspension liquid: a vinylidene chloride filter membrane which collects dust is placed in a small beaker, 4 ml of butyl acetate is accurately added, the mixture is uniformly mixed, and the dust suspension liquid is prepared; preparation of a dust sample: a clean blood cell counting board and cover glass are well placed, the dust suspension liquid sufficiently and uniformly mixed is sucked by a disposable dropper and added into a counting chamber for standing for 2-3 minutes, and dust particles naturally settle at the bottom of the counting chamber; and measurement of number concentration: the blood cell counting board where the dust sample is dropped is placed on an objective table of a microscope, all dust particles in four corners of a large grid at the center and five middle grids in the middle are counted by a high-power lens, and the total dust number concentration is calculated. The total dust number concentration is measured with a blood cell counting board method, and the method is scientific, advanced, simple and convenient to operate, controllable in error and capable of guaranteeing the accuracy of results.

The invention discloses a welding soot purifier. The welding soot purifier comprises a housing, an air inlet, an air outlet and a PLC control device which is arranged in the housing. A laminating filter cartridge and a negative in dedusting device are successively arranged along the flowing direction of gas, an induced draft fan is further arranged on an air flow channel, and the negative ion dedusting device and the induced draft fan are electrically connected to the PLC control device; welding soot can filter relatively large particles through the laminating filter cartridge and is ionized through the negative ion dedusting device and generates a lot of negative ions, so that the purifying effect is good and the purifying rate reaches 98% above, and the soot needs not to be discharged outward and can be directly used as an internal cycle of air in a working site, and meanwhile, the generated negative ions are conveyed to air to remove dust, sterilize and remove smells, so that the air quality of the working site is greatly improved; moreover, the purifier is precise in structure and small in noise, and is particularly suitable for working places generating flue gas, for example, handle welding, electric-arc welding, carbon-dioxide arc welding, MAG welding, carbon arc air gouging, gas fusion cutting, special welding and the like.

The invention provides a method for detecting concentration of dimethyl sulfoxide in workplace air. The method comprises the following steps: S1, sampler calibration; S2, in-situ sampling; S3, samplepretreatment; S4, chromatographic condition setting; S5, standard curve drawing; S6, sample determination; S7, calculation of the concentration of dimethyl sulfoxide in the workplace air. The detection method is simple to operate, the cost is lower, and samples can be collected and analyzed abundantly; by means of sample pretreatment with the method, fewer to-be-detected components are lost and detection accuracy is high; lower detection limit, higher sensitivity and higher analysis speed can be realized according to provided chromatographic conditions, the effect on separation between a solvent peak and to-be-detected substances is good, the linear range of a standard curve is wider, and the method is suitable for analyzing samples with different concentrations quickly and effectively.

A standard substance applied to detection of aromatic hydrocarbon compounds in air in a workplace comprises benzene, methylbenzene, o-xylene, m-xylene, p-xylene, ethylbenzene, phenylethylene and a substrate, wherein the substrate is coconut shell active carbon; the standard substance is arranged inside a container; the container is a cylindrical hard glass tube; the two ends of the glass tube are closed; the glass tube has the tube length of 120 mm, the inner diameter of 4.0 mm and the outer diameter of 6.0 mm. By using a syringe or a dynamic air distribution system, the content of seven benzene compounds in the prepared standard substance is approximate or equal to the content of the benzene compounds collected by a sampling tube when the sampling time is 15 min and the content of the benzene components in the air in the workplace is taken as time-weighted average allowable concentration or short-term exposure allowable concentration. Detection personnel can conveniently use the standard substance for calibrating an instrument and a working curve, and directly comparing and judging whether the concentration of the benzene compounds in the air in the workplace is approximate to or surpasses an occupational exposure limit.

The invention discloses a collection method for alkali metals and compounds thereof in air in a working place. The sampling can be finished by introducing the air in the working place into a sulfuric acid and methanesulfonic acid mixed aqueous solution which serves as an absorption medium. The collection method is simple, high in collection efficiency and high in absorption capacity. The invention also discloses a measurement method for the alkali metals and the compounds thereof in the air in the working place. The measurement method comprises the following steps of preparing a standard sequence of alkali metal ions; measuring a standard series, a sample and a blank reference solution through an ion chromatograph, drawing a standard curve, subtracting a response value measured by the sample into the standard curve to obtain the concentration of the alkali metal ions in the sample, and carrying out conversion to obtain the concentration of the alkali metals and the concentration of the compounds of the alkali metals in the air in the working place. According to the collection and measurement methods, various alkali metals and the compounds thereof can be simultaneously collected and measured through one-time sampling and under a chromatographic condition; the chromatographic measurement operation is simple; the stability is high; a result is reliable.

The invention relates to a determination method for the dispersity of dust in air of a working field. The determination method comprises the following steps: preparation of a dust suspension solution according to GBZ/T192.3-2007 and ocular lens micrometer calibration; preparation of a dust sample, namely inflating the uniformly-mixed dust suspension solution into a counting tank of a blood counting plate; standing and depositing dust grains at the bottom of the counting tank; dispersity determination, namely taking off an objective lens micrometer and putting the blood counting plate into which the dust sample is dropped on an objective table; finding out the dust grains by using a low-power lens; observing with magnifying power by a calibration ocular lens micrometer; selecting four corners of a large square cell at the center of the counting tank and five middle square cells at the center of the counting tank; sequentially determining the size of each dust grain by using the objective lens micrometer; measuring a long diameter when meeting a long diameter amount and measuring a short diameter when meeting a short diameter amount; and recording by groups and calculating the percentage. According to the determination method, a blood counting plate method is used for determining the dispersity of the dust so as to effectively avoid the error caused by human factors of smearing and measuring links in a previous method, and guarantee the accuracy of a determination result.

The invention provides a method for determining the content of methanol in air of a work place. The method comprises the following steps: collecting an air sample by using a silicone tube, dissolving the air sample by pure water, carrying out static headspace sample introduction, and detecting through a gas chromatograph (an FID detector). The method is mainly used for detecting the content of methanol in air of the work place.

The invention provides a method for determining the concentrations of sulfur trioxide and sulfuric acid in air of a working place. The method comprises the steps of preparing a mixed reagent, wherein the mixed reagent is prepared from absolute ethyl alcohol, a barium chloride solution and polyethylene glycol, and the volume ratio of the absolute ethyl alcohol to the barium chloride solution to the polyethylene glycol is 1 : 2 : (0.2 to 0.7); preparing a hydrochloric acid solution; mixing a sample solution, the mixed reagent and the hydrochloric acid solution, and determining the absorbance of a sample; comparing an obtained absorbance numerical value with a standard curve to obtain the concentrations of the sulfur trioxide and the sulfuric acid in the air of the working place. By taking the polyethylene glycol as a stabilizer, changing the proportion of the barium chloride mixed reagent and optimizing the concentration of the utilized hydrochloric acid and mixed reaction time of the reagent before determination, the linearity of the prepared standard curve is better in a process of determining the sulfur trioxide and the sulfuric acid, and the absorbance stabilizing time of the solution is long; each performance can meet the requirements of determining the sulfur trioxide and the sulfuric acid in the air.

The invention belongs to the field of organic matter detection, and specifically relates to a method for measuring ethylamine in workplace air by using a headspace capillary gas chromatographic method. The method comprises the following steps of measuring the ethylamine by using a gas chromatography-mass spectrum; preparing a standard solution, namely adding a sodium hydroxide solution, adding the ethylamine, and diluting by using the sodium hydroxide solution to obtain a mixture as a standard stock solution; processing a sample, namely respectively pouring front and rear silica gel after sampling into a headspace sampling bottle, adding the sodium hydroxide solution, shaking, placing the sodium hydroxide solution into an automatic headspace sampler, and pre-processing the sample. The measuring method provided by the invention has the advantages that the pre-processing process of the sample is optimized aiming at the problems in the practice process, the automatic headspace sampler is adopted to carry out sample injection on the sample, the volume of moisture which enters a chromatographic column is greatly reduced, the service life of the column is prolonged, the accuracy and the sensitivity of the method are improved, and the guidance and the reference are provided for solving the difficult problem of the practice inspection work.

The invention discloses an internet-of-things based workplace air monitoring system which comprises a shell, wherein an isolating box is fixedly connected to the interior of the shell; a temperature and humidity recorder is fixedly connected to the interior of the isolating box; a supporting plate is fixedly connected between the left side of the inner wall of the shell and the left side of the isolating box; and a controller is fixedly connected to the top of the supporting plate. The invention relates to the technical field of monitoring systems. According to the internet-of-things based workplace air monitoring system, a first supporting leg is opened to be grounded, so that the device can be conveniently positioned in air for detection, and the condition that the detection effect of the device is influenced due to much ground dust is avoided. By matching the thread and screw holes, the second supporting leg and the first supporting leg can be spliced, so that the air quality in a higher space can be measured, and the system is convenient to assemble. By matching slots and clamping blocks, the second supporting leg can be conveniently contained in a chuck, and the first supporting leg can be fixed by utilizing spring fasteners, so that the monitoring system is convenient to contain and easy to carry.

The invention belongs to the technical field of detection of sulfur dioxide in workplace air and ambient air, and discloses an anti-oxidation sulfur dioxide ion chromatography detection method. The method comprises the following steps: preparing a triethanolamine aqueous solution with a certain concentration as a sampling absorption solution; absorbing and collecting SO2 in the air of the occupational place by using the absorption solution; and qualitatively and quantitatively analyzing the SO2 by using the absorption solution through ion chromatography. According to the method, the triethanolamine aqueous solution is used as an absorption solution, triethanolamine and SO2 form a stable complex, SO2 can be prevented from being oxidized by air, the complex can resist the high temperature of37 DEG C for 7 days, SO2 non-derivative direct ion chromatographic analysis and detection are achieved, and separation and detection of SO3 in air can be effectively achieved; meanwhile, occupationalhealth and environmental harm of highly toxic substances such as formaldehyde or mercury salt used in an existing national occupational health standard detection method to workers are avoided.

The invention discloses a method for determining cesium and compounds thereof in air of a workplace. The method comprises the following steps: sampling for a short time and a long time at a sampling point by adopting a sampling clamp provided with a microfiltration membrane; placing the sampled microporous filter membrane in a beaker, adding pure water and dilute nitric acid for digestion, and finally fixing the volume to a volumetric flask to keep the nitric acid acidity of 1% (v/v); analyzing the sample solution by adopting an inductively coupled plasma mass spectrometer, and determining the content of cesium and compounds thereof in the sample solution according to the spectral intensity; and calculating through a formula to obtain the concentration of cesium and cesium compounds in air. The method overcomes the defects of traditional cesium and cesium compound detection, avoids chemical interference and ionization interference, improves the elution efficiency of cesium in the microfiltration membrane, realizes analysis and determination of trace and ultra-trace cesium and cesium compound, and ensures the accuracy and reliability of caesium and cesium compound occupational hazard factor detection results in a precise cesium processing technology.

The invention discloses an environment-friendly five-color printing press and relates to the technical field of printing equipment. According to the technical scheme, the environment-friendly five-color printing press is characterized in that the printing press comprises a machine body and five printing mechanisms located in the machine body in sequence in the paper conveying direction; a conveying inlet is formed in one end of the machine body, and a conveying outlet is formed in the other end of the machine body; each printing mechanism comprises an ink groove, an ink feeding roll, a coatingroll and a pressure roll, and the ink feeding roll, the coating roll and the pressure roll are rotationally connected and abut against one another; the machine body is connected with a drying mechanism and an air purifying mechanism; the air purifying mechanism comprises a tank which is internally provided with at least two purifying chambers communicating with one another; and every two adjacentpurifying chambers communicate through a communication pipe, wherein one purifying chamber communicates with the interior of the machine body through a main air inlet pipe, and the other purifying chamber is provided with an air outlet pipe. By means of the environment-friendly five-color printing press, the problem that a current printing press emits irritant gas towards a working site in the printing process to affect the health is solved, air inside the printing press can be treated, and air at the working site is kept fresh.

The invention relates to a self-absorption type gas sampling bag and application thereof, and mainly solves the problem that a gas sampling bag in the prior art is hard to sample alkane type compoundswith relatively low boiling point from the air of a work place. The self-absorption type gas sampling bag comprises an inner layer of the gas sampling bag, an outer layer of the gas sampling bag anda valve; the inner layer is made of an aluminum foil, an outer layer is made of emulsion, and the valve is made of polytetrafluoroethylene; and the thickness of the inner layer to that of the outer layer is 0.1-0.2:1. The above problem can be solved effectively, and the gas sampling bag can be applied to gas sampling.

The present invention belongs to the technical field of workplace air detection, and particularly relates to a method for determining the acrylamide in the air of a workplace through a gas chromatography method. The method comprises: carrying out a bromination reaction on taken air samples in a reaction tube to obtain dibromopropionamide for detection. Compared to the method in the prior art, the method of the present invention has the following advantages that the dibromopropionamide is generated from the acrylamide so as to conveniently detect; the acrylamide bromination rate is high so as to easily improve the accuracy of the experiment; with the application of the method to determine the low concentration acrylamide in the workplace, the reliability is high, the national requirements can be met, and the detection is rapid; and the minimum detection concentration is 0.004 mg/m<3> in 50 L of the collected sample; the anti-interference is strong; and the method can be used for the determining the acrylamide concentration in the air of the workplace.

The invention discloses a method for determining the content of boron and compounds thereof in air of a workplace. The method comprises the following steps: collecting an air sample in the workplace by adopting a porous glass plate absorption tube with a sodium hydroxide absorption liquid provided therein; pouring the sample collected absorption liquid sample into a beaker, adjusting the absorption liquid sample to neutrality by using diluted nitric acid, adding two droplets of hydrogen peroxide, transferring the obtained sample to a boron-free glass volumetric flask, and adding nitric acid to maintain the acidity of the absorption liquid; and analyzing and determining the boron content of the absorption liquid sample by using a plasma spectrum analyzer, and calculating the boron content of borane, diborane, pentaborane and boron trifluoride in the workplace according to the boron concentration in the absorption liquid and the collecting volume. The method has the advantages of simplicity, fastness, high efficiency, strong interference resistance, high sensitivity and precision, and avoiding of harms of boron and the compounds thereof in air of the workplace to the health of bodies of workers through realizing synchronous synthesis and determination of the content of various harmful compounds of boron in the workplace.