CN101551338B - Method for determining formaldehyde in air - Google Patents

Method for determining formaldehyde in air Download PDF

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Publication number
CN101551338B
CN101551338B CN2009100092411A CN200910009241A CN101551338B CN 101551338 B CN101551338 B CN 101551338B CN 2009100092411 A CN2009100092411 A CN 2009100092411A CN 200910009241 A CN200910009241 A CN 200910009241A CN 101551338 B CN101551338 B CN 101551338B
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bottle
formaldehyde
colorimetric
sample
colorimetric bottle
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CN101551338A (en
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谢华庆
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BEIJING ZHONGKE ZHONGHUAN ENVIRONMENTAL APPLIED TECHNOLOGY RESEARCH CENTER
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BEIJING ZHONGKE ZHONGHUAN ENVIRONMENTAL APPLIED TECHNOLOGY RESEARCH CENTER
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Abstract

The invention discloses a method for determining formaldehyde in air which comprises the following steps of: (1) sample acquisition; (2) zero calibration: before stopping a sampler, taking an empty colorimetric bottle, weighing formaldehyde absorption liquid, then adding distilled water, dropwise adding 1% ferric sulfate ammonia chromogenic solution into the colorimetric bottle, screwing a bottle cap, and fully shaking and evenly mixing; and after standing, putting the colorimetric bottle in a colorimetric groove of a formaldehyde determinator and locking the colorimetric bottle by using a positioning cover of the colorimetric groove, pressing a 'zeroing' key of the formaldehyde determinator, and completing the testing zeroing when 0.00 appears on a display screen; and (3) sample determination: when sampling is completed, moving formaldehyde gas absorption fluid collected by sampling to another empty colorimetric bottle, adding proper amount of distilled water and L1% ferric sulfate ammonia chromogenic solution, then screwing the bottle cap, fully shaking and evenly mixing; and after standing, wiping the outer wall of the sample colorimetric bottle with clean cloth, putting the sample colorimetric bottle in the colorimetric groove of the formaldehyde determinator and locking the sample colorimetric bottle by using the positioning cover of the colorimetric groove, pressing a 'concentration' key of the formaldehyde determinator and obtaining the concentration displayed value of the formaldehyde in air to be determined which is the numerical value displayed on the liquid crystal screen.

Description

Method for determining formaldehyde in the air
Technical field
The present invention relates to a kind of technical field of gas detection, be meant a kind of assay method that detects formaldehyde in the air especially.
Background technology
A large amount of now finishings, the use of ornament materials, make that indoor air pollution is more and more serious, wherein to count the harm maximum of formaldehyde, formaldehyde is the magma poisonous substance, and energy and protein bound are behind the suction high-concentration formaldehyde, the serious stimulation of respiratory tract and oedema, eye shouting pain, headache can appear, also bronchial astehma can take place, sucking formaldehyde for a long time can be carcinogenic, brings out leukaemia.In the middle of the daily life, formaldehyde is present in the materials such as the decoration of numerous species and furniture, in use formaldehyde can come out from these materials at leisure, it is almost tasteless again when concentration is low, often suck a small amount of formaldehyde unconsciously, can cause slow poisoning, therefore, people should often test the air quality of own living environment, in case harmful gas brings injury.And at present, generally use the colour atla counter point, and though this easy detection means has low, the easy-operating advantage of cost, detected numerical value accuracy is relatively poor, and the testing staff is under the influence of chromatic discrimination power and light, and error can be bigger; Adopt spectrophotometer method to measure in addition, this needs the analysis of large-scale instrument, manually calculate the concentration of institute's test sample product then, detected numerical value accuracy is higher, but need professional's operation, corresponding knowledge and chemical reagent also will be arranged and analyze preparation, waste time and energy, the cost height can't spread to family and use.
Summary of the invention
The object of the present invention is to provide a kind of assay method that can on-the-spot fast, accurately detect content of formaldehyde in the air.
For reaching above-mentioned purpose, the present invention adopts following technical scheme:
The assay method step of formaldehyde is as follows in a kind of air:
(1) collected specimens
One air sampler is fixed on the three-legged supporting frame, or is positioned on the indoor desktop, adjust sampling thief to level, the height of sampling thief is 0.8m~1.5m at people's breathing zone height; Bubble absorption bottle U type bracing frame is hung on the sampling thief side, again the bubble absorption bottle is inserted on the bracing frame, connect bubble absorption bottle, safety flack, sampling thief gas production flexible pipe with sebific duct; Take out the interior pipe of bubble absorption bottle, the formaldehyde absorbent of accurately measuring 5ml with transfer pipet splashes into the bubble absorption bottle and the interior pipe of bubble absorption bottle is turned back to, make the ground interface closely knit, and make the collection air intake opening towards each gas production direction, according to the GB/T18204.26-2000 regulation, determine gas production 10L, time 20min, regulate flowmeter to required sampling flow, be 500ml/min, carry out sample collecting;
(2) Zero calibration
Before sampling is shut down, got colorimetric bottle, open bottle cap, accurately measure formaldehyde absorbent 5ml with transfer pipet, add distilled water again to 10ml, with 0.4ml concentration is that 1% ferric ammonuiium alum chromophoric solution splashes in the colorimetric bottle, screw bottle cap then, shake abundant mixing in 10 seconds, allow colorimetric bottle is static to be stablized 15 minutes, dry the colorimetric bottle outer wall with clean cloth, colorimetric bottle is put into the cell of formaldehyde determination instrument, decide with cell location cover lock, press the zeroing key of formaldehyde determination instrument, 0.00 expression blank testing zeroing appears in display screen to be finished;
(3) mensuration of sample
Sampling finishes, the absorption liquid of the formaldehyde gas of sample collection in the bubble absorption bottle is moved in another blank colorimetric bottle with glue head dropper, at every turn with the distilled water of 2~3ml repeatedly towards Xian's bubble absorption bottle 2~3 times, and this solution transferred in the sample colorimetric bottle, making sample colorimetric bottle sample liquid is 10ml, screw sample colorimetric bottle cap, shake abundant mixing in 10 seconds, open sample colorimetric bottle cap, with 0.4ml concentration is that 1% ferric ammonuiium alum chromophoric solution splashes in the sample colorimetric bottle, screw bottle cap then, shake abundant mixing in 10 seconds, make that the sample colorimetric bottle is static to be stablized 15 minutes, dry sample colorimetric bottle outer wall with clean cloth, the sample colorimetric bottle is put into the cell of formaldehyde determination instrument, and locate cover lock with cell and decide, press " concentration " key of formaldehyde determination instrument, the numerical value that shows on the liquid crystal display is the displayed value of tested air formaldehyde concentration.
After adopting such scheme, the present invention generates the colored compound colorimetric analysis that selective absorption colour developing is set up to visible light by formaldehyde in the sample and developer reaction back, compare by conversion and predefined chemical standard curve, again to the correction of temperature, humidity, pressure influence in the air, directly provide accurate concentration of formaldehyde value, need not by artificial computing, on-the-spot test is time saving and energy saving, and test result is more accurate again.
Below cooperate specific embodiment that the present invention is elaborated.
Embodiment
The assay method step of formaldehyde is as follows in the air of the present invention:
(1), collected specimens
One air sampler is fixed on the three-legged supporting frame, or is positioned on the indoor desktop, (principle of work of this air sampler is a located by prior art, non-emphasis of the present invention, do not repeat them here), adjust sampling thief to level, height is at people's breathing zone height (about 0.8m~1.5m); Bubble absorption bottle U type bracing frame is hung on the sampling thief side, again bubble heat absorbing glass pipe is inserted on the bracing frame, connect bubble absorption bottle, safety flack, sampling thief gas production flexible pipe with sebific duct; Take out the interior pipe of bubble absorption bottle, the formaldehyde absorbent of accurately measuring 5mL with transfer pipet splashes into the bubble absorption bottle and the interior pipe of bubble absorption bottle is turned back to, make the ground interface closely knit, and make each gas production direction of collection air inlet actinal surface, according to the GB/T18204.26-2000 regulation, determine gas production 10L, time 20min, regulate flowmeter to required sampling flow, be 500Ml/min, carry out sample collecting.
(2), Zero calibration
Before sampling is shut down; got colorimetric bottle; open bottle cap; accurately measure formaldehyde absorbent 5mL with transfer pipet; add distilled water again to 10mL; 0.4mL1% ferric ammonuiium alum chromophoric solution is splashed in the colorimetric bottle; screw bottle cap then, shake abundant mixing in 10 seconds, allow colorimetric bottle is static stablizes 15 minutes (its developing time differences of different temperatures; see attached list); dry the colorimetric bottle outer wall with clean cloth, colorimetric bottle is put into the cell of formaldehyde determination instrument, with cell location cover lock fixed (must cover completely influence in case extraneous veiling glare enters accuracy); press " zeroing " key of formaldehyde determination instrument, 0.00 expression blank testing zeroing appears in display screen to be finished.
(3), the mensuration of sample
Sampling finishes, the absorption liquid of the formaldehyde gas of sample collection in the bubble absorption tube is moved in another blank colorimetric bottle with glue head dropper, get again that an amount of (each 2~3mL) distilled water is repeatedly towards Xian's bubble absorption tube 2~3 times, and this solution transferred in the sample colorimetric bottle, making sample colorimetric bottle sample liquid is 10mL, screw sample colorimetric bottle cap, shake abundant mixing in 10 seconds, open sample colorimetric bottle cap, 0.4mL1% ferric ammonuiium alum chromophoric solution is splashed in the sample colorimetric bottle, screw bottle cap then, shake abundant mixing in 10 seconds, make that the sample colorimetric bottle is static stablizes 15 minutes (its developing time difference of different temperatures is seen attached list), dry sample colorimetric bottle outer wall with clean cloth, the sample colorimetric bottle is put into the cell of formaldehyde determination instrument, and locate cover lock with cell and decide, press " concentration " key of formaldehyde determination instrument, the numerical value that shows on the liquid crystal display is the displayed value of tested air formaldehyde concentration.As seek out through temperature, humidity, the revised concentration of formaldehyde value of barometric pressure effect, then do not take out the sample colorimetric bottle, " concentration " key of pinning the formaldehyde determination instrument unclamps for 2 seconds again, see that air pressure on the display screen " BARO " " HPa " is flashing, then the concentration value that at this moment shows is through temperature, humidity, the revised concentration of formaldehyde value of air pressure.
Air formaldehyde concentration calculates under the standard state
C0=C/V0*Vp
V0=Vt*273/273+t*p/1013 wherein
In the formula
C is the instrument indicating value of air formaldehyde concentration, mg/m3
C0 is a concentration of formaldehyde value under the standard state, mg/m3
V0 is the sampling volume under the revised standard state, L
Vp is default air sampling volume, L, its numerical value during with mensuration in the colorimetric bottle mL number of liquor capacity identical,
Vt is a sampling volume, and L is a sampling flow, (measured value behind the flux modification) and sampling time product,
T is the temperature of sampled point, degree centigrade
P is the atmospheric pressure HPa of sampled point
The relation of subordinate list formaldehyde colour temp and developing time and stabilization time
Above embodiment is only for the usefulness that the present invention is described, but not the restriction to inventing, person skilled in the relevant technique under the situation that does not break away from the spirit and scope of the present invention, can also be made various conversion or variation.Therefore, all technical schemes that are equal to also should belong to category of the present invention, should be limited by each claim.

Claims (1)

1. method for determining formaldehyde in the air is characterized in that the assay method step is as follows:
(1) collected specimens
One air sampler is fixed on the three-legged supporting frame, or is positioned on the indoor desktop, adjust sampling thief to level, the height of sampling thief is 0.8m~1.5m at people's breathing zone height; Bubble absorption bottle U type bracing frame is hung on the sampling thief side, again the bubble absorption bottle is inserted on the bracing frame, connect bubble absorption bottle, safety flack, sampling thief gas production flexible pipe with sebific duct; Take out the interior pipe of bubble absorption bottle, the formaldehyde absorbent of accurately measuring 5ml with transfer pipet splashes into the bubble absorption bottle and the interior pipe of bubble absorption bottle is turned back to, make the ground interface closely knit, and make the collection air intake opening towards each gas production direction, according to the GB/T18204.26-2000 regulation, determine gas production 10L, time 20min, regulate flowmeter to required sampling flow, be 500ml/min, carry out sample collecting;
(2) Zero calibration
Before sampling is shut down, got colorimetric bottle, open bottle cap, accurately measure formaldehyde absorbent 5ml with transfer pipet, add distilled water again to 10ml, with 0.4ml concentration is that 1% ferric ammonuiium alum chromophoric solution splashes in the colorimetric bottle, screw bottle cap then, shake abundant mixing in 10 seconds, allow colorimetric bottle is static to be stablized 15 minutes, dry the colorimetric bottle outer wall with clean cloth, colorimetric bottle is put into the cell of formaldehyde determination instrument, decide with cell location cover lock, press the zeroing key of formaldehyde determination instrument, 0.00 expression blank testing zeroing appears in display screen to be finished;
(3) mensuration of sample
Sampling finishes, the absorption liquid of the formaldehyde gas of sample collection in the bubble absorption bottle is moved in another blank colorimetric bottle with glue head dropper, at every turn with the distilled water of 2~3ml repeatedly towards Xian's bubble absorption bottle 2~3 times, and this solution transferred in the sample colorimetric bottle, making sample colorimetric bottle sample liquid is 10ml, screw sample colorimetric bottle cap, shake abundant mixing in 10 seconds, open sample colorimetric bottle cap, with 0.4ml concentration is that 1% ferric ammonuiium alum chromophoric solution splashes in the sample colorimetric bottle, screw bottle cap then, shake abundant mixing in 10 seconds, make that the sample colorimetric bottle is static to be stablized 15 minutes, dry sample colorimetric bottle outer wall with clean cloth, the sample colorimetric bottle is put into the cell of formaldehyde determination instrument, and locate cover lock with cell and decide, press " concentration " key of formaldehyde determination instrument, the numerical value that shows on the liquid crystal display is the displayed value of tested air formaldehyde concentration; The concentration key of pinning the formaldehyde determination instrument unclamps for 2 seconds again, sees that air pressure BARO, HPa are flashing on the display screen, and then the concentration value that at this moment shows is through temperature, humidity, the revised concentration of formaldehyde value of air pressure.
CN2009100092411A 2009-02-25 2009-02-25 Method for determining formaldehyde in air Active CN101551338B (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107202769A (en) * 2017-07-11 2017-09-26 安徽宏远职业卫生技术服务有限公司 A kind of method of room air sample pretreatment during detection formaldehyde

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103234926B (en) * 2013-04-15 2015-02-18 王冠 Method for determining indoor air formaldehyde content
CN104251859B (en) * 2013-06-28 2017-02-08 成都谱视科技有限公司 Gas detection analyzer based on intelligent terminal and testing method
CN105675600B (en) * 2016-02-24 2018-10-12 张银虎 Multi-tester
CN109270058B (en) * 2018-10-18 2021-02-09 郑州市宇驰检测技术有限公司 Device and method for detecting formaldehyde content in air
CN112067751A (en) * 2020-09-11 2020-12-11 深圳市建筑科学研究院股份有限公司 Emission detection device
CN112903373A (en) * 2021-01-19 2021-06-04 亚楠(南京)环保科技有限公司 Sampling equipment for preventing and treating formaldehyde pollution

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107202769A (en) * 2017-07-11 2017-09-26 安徽宏远职业卫生技术服务有限公司 A kind of method of room air sample pretreatment during detection formaldehyde

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