甲醛检测仪使用简介（Use profile of formaldehyde detector）Xuzhou jincheng to create a perfect life for your green and healthy home xuzhou jincheng to create a better life together with you, wish you a bright futureThe method of formaldehyde detection and the use of formaldehyde detector in xuzhou jincheng environmental protection:At present, the methods of formaldehyde detection in domestic and foreign bedrooms, textiles and food mainly include spectrophotometry, electrochemical detection, gas chromatography, liquid chromatography, and sensor method.1.1 spectrophotometrySpectrophotometric method is based on the molecular structure of different substances on the selective absorption of electromagnetic radiation and to establish a qualitative and quantitative analysis method, is in the bedroom, textiles, food, one of the most conventional formaldehyde detection method. Currently involved with acetyl acetone method, phenol reagent method and AHMT method a sulfurous acid, magenta, chromotropic acid method, phloroglucinol method, catalytic photometric method, etc., each test method of lay particular stress on the application area is different, and each has its advantages and limitations.1.1.1 acetyl acetone method. Acetyl acetone method refers to the presence of ammonium salt, excessive formaldehyde and acetyl acetone by 45 ~ 60 ℃ water bath for 30 min or 25 ℃ by2.5 h reaction at room temperature to generate yellow compound, quantitative analysis and then [4-7] formaldehyde content, formaldehyde and acetyl acetone reaction specificity, less interference factors, phenols and other aldehydes are not interference, when the agent is relatively stable, the detection limit is 0.25 me/L [Bl, determination of wide linear range, suitable for high levels of formaldehyde detection, more used to the bedroom and determination of formaldehyde in water with food. But in the detection of formaldehyde in water with food when will sample the formaldehyde in phosphoric acid medium heat distillation extract, the capacity after the aqueous absorption, inspecting, complex, tedious,time-consuming operation process.1.1.2. Phenol reagent method of phenol reagent method namely MBTH method, namely, formaldehyde and phenol reagent (3 a methyl 2 a benzothiazole hydrazone hydrochloride, ugrn) reaction, lamictal in acid solution by iron oxide into blue, color after 15 rain, at room temperature, quantitative analysis and then [m]. Phenol reagent method is simple, high sensitivity, detection limit of 0.02 mg/L, and suitable for determination of trace formaldehyde determination. But aliphatic aldehydes have similar reactions, the determination of interference, the interference of sulfur dioxide to measure also to have certain, make the results on the low side, so, in the determination of sodium formaldehyde sulfoxylate when applying this method carefully. The stability of the phenol reagent is poorer, MITI agent? H at 4 ℃ refrigerator can save 3 d, only after the color stability of the absorbance and acetyl acetone method, color restricted by time and temperature, etc. This is used for detection of formaldehyde in the bedroom. Sometimes for thedetermination of formaldehyde in textiles and food are a in the way.1.1.3 AHMT method. With AHMT AHMT method refers to formaldehyde (4 a amino 3 a hydrazine, 5 a sulfhydryl group 1,4-trichlorobenzene tourism nitrogen mixed alum) under the condition of alkaline condensation, potassium periodate oxidation into purple compound, quantitative analysis and detection method of formaldehyde content [13]. This method is specificity and selectivity are better, in a large amount of acetaldehyde, propionaldehyde, butyl aldehyde material such as formaldehyde, benzene acetaldehyde coexistence does not interfere with the determination, the detection limit of 0.04 mg/l. but AHMT method during operation color deepened gradually, over time the chromogenic reaction of the standard solution and sample solution of chromogenic reaction time must be strictly unification, reproducibility is poorer, difficult operation, used for detection of formaldehyde in the bedroom.1.1.4 fuchsin sulfite method. Magenta a sulfite method refers to the use of formaldehyde and magenta sulphurous acid under the condition of the existence of sulfuric acid are the characteristics of violet, quantitative analysis with the testing method of [HI1. Used in this law, it is the peculiar reaction of formaldehyde and other aldehydes and phenol is not interference measurement. This method is simple, the determination of a wide range, but its color liquid is very unstable, poor reproducibility, in the sample of the determination of formaldehyde content is low, the difference is bigger, precision than acetyl acetone method, greatly influenced by temperature and magenta sulphurous acid method,test process still need sulfuric acid, so the more commonly used for the qualitative analysis of formaldehyde in food.1.1.5 chromic acid method. Chromic acid method refers to the change of formaldehyde in concentrated sulfuric acid to chromic acid (1, 8, 1, 8, 1, 2, 1, 2, 1, 1, 2, 1, 2, 1, 2, 1, 2, 1, 2, 1, 8, 1,6 December sulfonic acid) role in a boiling water bath generated in the purple compound, quantitative analysis of the method. This method high sensitivity, detection limit of 0.1 mg/L color liquid stability. But when you have interference ion coexist, phenols and its additive therefore the law is not applicable to the sample of the determination of formaldehyde content is higher. Because of the formaldehyde content is high in acid solution to produce polymers, so the reaction must be under the action of concentrated sulfuric acid medium, the operation is complicated, so the method is used to study more, less actual detection application. Phloroglucinol method. Phloroglucinol method refers to the use of formaldehyde in alkaline conditions generated by condensation reaction with phloroglucinol orange compound features, color quantitative detection method of formaldehyde content [". This method is simple, small distractions affect, detection limit of 0.1 mg/L. But with the products of phloroglucinol, formaldehyde color is not stable, the determination results, the deflection is only applicable to the qualitative analysis of formaldehyde. This method is used for water determination of formaldehyde in food.1.1.7 catalytic spectrophotometry, catalytic photometric method refers to the water bath, under the condition ofcatalytic potassium bromate in phosphoric acid medium formaldehyde a bromocresol purple led, golden orange O0 or methyl red [20] [21] and so on carries on the REDOX reaction, make its fading reaction system and to establish the determination method of formaldehyde. This method is a new research method, easy operation, the detection limit of0.04-0.2 mg/L, reaction rate are greatly influenced by temperature, usually for determination of formaldehyde in water with food. The spectrophotometry relatively poor stability, vulnerable to aldehyde, phenol, the interference of the composition such as glucose, operation process trival, analyzing time is too long, it is difficult to directly on-site rapid detection for formaldehyde, scope of application.1.2 electrochemical methodElectrochemical analysis method is based on chemical reactions, and power generated by the current (voltammetry) (coulomb's law), the change of electric potential method (potential), to determine the concentration of the analyte in the reaction system of quantitative analysis method, polarographic method and potential method to detect formaldehyde 2 kinds.1.2.1 oscillographic polarographic determination method. The oscillographic polarographic determination method referred to as "polarography, is current a voltage curve obtained by polarographic method for the determination of wave is analyzed. The bottom of the formaldehyde in phenylhydrazine hydrochloride sodium chloride solution is formed in a clear, polarographic wave peak current is proportional to the content of formaldehyde, formaldehyde standard according to the samplepeak current and peak current compared quantitatively detect [a; or in the pH value of 5 a sodium acetate acetic acid medium, the reaction of formaldehyde with hydrazine sulfate product produce a sensitive adsorption wave, its peak height and the formaldehyde concentration has a linear relationship within a certain range [24], according to the relationship for quantitative detection of formaldehyde. The method is simple, good selectivity, but requiring polarographic analysis method for sample pretreatment, using" dropping mercury electrode has pollution, currently used in food and detection of formaldehyde in food packaging materials.1.2.2 potentiometry. Potential method is also called the ion selective electrode method, is the use of membrane electrode converts the activity of the measured ion electrode potential and a method for the determination of them. In sulfuric acid medium, formaldehyde on the oxidation of potassium bromate potassium iodide has promoting effect, using this feature, use iodine ion selective electrode tracking I a, can a dynamic potential method was developed for the determination of trace formaldehyde (. The method of linear range of 0 to 5 mg/L, the detection limit of 0.055 mg/L. This method is a new research method, less in practice.1.3 chromatographyChromatography is a powerful separation efficiency, not easily affected by the interference of sample matrix and color reagent, sensitive and accurate detection of complex samples can be directly used in the bedroom, the analysis of formaldehyde in textiles, food detection. Can also sample derivatization offormaldehyde in processing, to determine the commonly used agent derived from 2, 4 or nitrobenzene hydrazine (DNPH), narrow azole, ethyl mercaptan, hydrazine sulfate and so on. Such as' SuiXueYan [26] will sample the formaldehyde and the DNPH derivative, generate 2, 4 December nitrobenzene hydrazone, toluene or n-hexane extraction, chromatographic separation by capillary and packed column gas phase, with electron capture detector, according to a qualitative and quantitative detection, retention time and peak widthDetection limit of 0.001 5 mg/L, including ethanol, acetone, sulphur dioxide and nitrogen oxides are not produce interference. Xiao-mei Chen such as [the formaldehyde in the sample training and DNPH derivative, the extraction and separation using high performance liquid chromatography (HPLC), with uv detector, according to retention time and peak area for quantitative and qualitative detection, the detection limit of 0.05 mg/Lt training. In the bedroom, textiles, food sample components generally more complex, the interfering component, formaldehyde content is low, the conventional detection method of the need to spend a lot of time and energy for separation and enrichment of pretreatment before testing. Chromatography quantitative accuracy, strong anti-interference, high sensitivity, can be directly used in the detection of formaldehyde in the bedroom, textiles, food. But the chromatography of equipment demand is higher, derivatization long, extraction procedure, such as cumbersome process of operation, not suitable for general laboratory and on-site rapid detection of family, it is hard to meet the market demand.1.4 sensorSensor used for determination of formaldehyde with electrochemical sensor, optical sensor and optical biosensor etc. Electrochemical sensor [training structure is simple, the cost is lower, the high quality of the product performance is stable, measurement range and resolution of basic can meet the requirements of the indoor environment testing. But the disadvantage is that the interference substances, and as a result of electrolyte irreversible chemical reaction with formaldehyde gas to be measured by consumption, so its working life is shorter. General optical sensor price is more expensive, 30, and large, do not apply to the online real-time analysis, the use of generalized restricted. Although the biochemical sensors can improve the selectivity of light, but because of the activity of enzyme sensors, and other factors lead to instability and lack of practicability, formaldehyde gas sensors and the general price is too high, it is difficult to popularize.2 lookAs people living standard is increasing day by day, the bedroom, such as formaldehyde in textiles, food safety accidents occur frequently, is becoming more and more serious, so it is necessary to establish a simple, sensitive, fast and intuitive, accurate and economic formaldehyde detection method. In each family, residents can achieve his bedroom, formaldehyde in textiles, food online real-time detection is needed by the market, people oriented. It is not an ideal formaldehydeon-site rapid detection method of spectrophotometric by water bath or sulfuric acid to the operating conditions such aselectrochemical method for sample pretreatment and high demand chromatography restricted by instruments, sensors detect formaldehyde high cost, short service life, and now in the market of rapid detection of formaldehyde box need professional operation, the cost is high, the average household is difficult to popularize. Therefore to establish a simple, rapid and sensitive on-line detection method of formaldehyde is timely and necessary. Existing emerging technologies, such as micro total analysis system, the introduction of the solid phase microextraction techniques can reduce the detection limit of detection of formaldehyde, to avoid interference, on-site rapid detection for formaldehyde more portable provides more likely.The characteristics of the indoor air detector and the formaldehyde measuring instrument of other types of air detector in the market:1. The large digital tube display makes the spectral reading function more concise and clear2. Three-button foolproof operation menu, easy to operate3. Test report of the customized format of on-site thermal printing4. The original readout curve adjustment function, which is convenient for self-calibration of machine readings, and can also produce a standard reading or high or low reading according to the testTechnical indicators:1. Measuring range:Formaldehyde: 0.01 ~ 1.20 mg/m3Benzene: 0.05 ~ 4 mg/m3Ammonia: 0.05 ~ 3 mg/m3Toluene: 0.05 ~ 4 mg/m3Xylene: 0.05 ~ 4mg/m3TVOC: 0.05 ~ 4 mg/m3Accuracy: the reading error is < 5%3. Sensor: imported photoelectric sensor4. Light source: LED silicon photodiode, wavelength of 630nm5. Timing control: 0 -- 60 minutes, 6 independent time machine controlPower: 220V acThe instrument can be designed in four styles:1. Standard panel size 40 * 27cm2. Standard panel size 40 * 27cm with sampler3. Small panel size 40 * 22cm4. Small panel size 40 * 22cm with sampler。