1 適用范圍

　　本標準規(guī)定了測定環(huán)境空氣和固定污染源廢氣中三甲胺的溶液吸收-頂空/氣相色譜法。本標準適用于環(huán)境空氣、固定污染源無組織排放監(jiān)控點空氣和有組織排放廢氣中三甲胺的測定。若通過驗證,本標準也可適用于其他揮發(fā)性脂肪胺類物質的測定。

　　采用氫火焰離子化檢測器時,當空氣采樣體積為 20L(標準狀態(tài)),吸收液體積為 10ml 時,方法檢出限為 0.004mg/m3,測定下限為 0.016mg/m3;當廢氣采樣體積為20L(標準狀態(tài)),吸收液體積為50ml 時,方法檢出限為 0.04mg/m3,測定下限為 0.16mg/m3。

　　采用氮磷檢測器時,當空氣采樣體積為 20L(標準狀態(tài)),吸收液體積為10ml 時,方法檢出限為 0.0007mg/m3,測定下限為 0.0028mg/m3;當廢氣采樣體積為 20L(標準狀態(tài)), 吸收液體積為50ml 時,方法檢出限為 0.006mg/m3,測定下限為 0.024mg/m3。

　　2 規(guī)范性引用文件

　　本標準引用了下列文件或其中的條款。凡是不注日期的引用文件,其有效版本適用于本標準。

　　GB 14554 惡臭污染物排放標準

　　GB/T 16157 固定污染源排氣中顆粒物測定和氣態(tài)污染物采樣方法

　　HJ 194 環(huán)境空氣質量手工監(jiān)測技術規(guī)范

　　HJ 905 惡臭污染環(huán)境監(jiān)測技術規(guī)范

　　HJ/T 55 大氣污染物無組織排放監(jiān)測技術導則

　　HJ/T 375 環(huán)境空氣采樣器技術要求及檢測方法

　　HJ/T 397 固定源廢氣監(jiān)測技術規(guī)范

　　3 方法原理

　　三甲胺經稀酸吸收后,將吸收液轉移至頂空瓶內,處理后密封。在一定的溫度條件下, 頂空瓶內樣品中三甲胺向液上空間揮發(fā),產生蒸汽壓,在氣液兩相達到熱力學動態(tài)平衡后, 氣相中的三甲胺經氣相色譜分離,用氫火焰離子化檢測器/氮磷檢測器進行檢測。根據(jù)色譜峰保留時間定性,外標法定量。

　　4 干擾和消除

　　在本方法推薦的分析條件下,氨、甲胺、二甲胺、乙胺、二乙胺和三乙胺均可與三甲胺實現(xiàn)有效分離，不干擾測定。

　　名稱:HH-Tamine30三甲胺毛細管柱

　　規(guī)格:30m*0.32mm*5.0um

　　使用溫度:280°C

　　編號:20230930003

　　1 Scope of application

　　This standard specifies the solution absorption headspace/gas chromatography method for the determination of trimethylamine in ambient air and fixed source waste gas. This standard is applicable to the determination of trimethylamine in ambient air, unorganized emission monitoring point air from fixed pollution sources, and organized emission waste gas. If verified, this standard can also be applied to the determination of other volatile fatty amine substances.

　　When using a hydrogen flame ionization detector, when the air sampling volume is 20L (standard state) and the absorption liquid volume is 10ml, the detection limit of the method is 0.004mg/m3, and the detection limit is 0.016mg/m3; When the sampling volume of exhaust gas is 20L (standard state) and the absorption liquid volume is 50ml, the detection limit of the method is 0.04mg/m3, and the lower limit of determination is 0.16mg/m3.

　　When using a nitrogen phosphorus detector, when the air sampling volume is 20L (standard state) and the absorption liquid volume is 10ml, the detection limit of the method is 0.0007mg/m3, and the lower limit of the determination is 0.0028mg/m3; When the sampling volume of exhaust gas is 20L (standard state) and the absorption liquid volume is 50ml, the detection limit of the method is 0.006mg/m3, and the lower limit of determination is 0.024mg/m3.

　　2 Normative References

　　This standard references the following documents or their clauses. For undated references, their valid versions are applicable to this standard.

　　GB 14554 Emission Standard for Odor Pollutants

　　GB/T 16157 Measurement of Particulate Matter and Sampling Method for Gaseous Pollutants in Fixed Source Exhaust Gas

　　HJ 194 Technical Specification for Manual Monitoring of Environmental Air Quality

　　HJ 905 Technical Specification for Environmental Monitoring of Odor Pollution

　　HJ/T 55 Technical Guidelines for Monitoring Unorganized Emissions of Air Pollutants

　　HJ/T 375 Technical Requirements and Testing Methods for Environmental Air Samplers

　　HJ/T 397 Technical Specification for Fixed Source Waste Gas Monitoring

　　3 Method principles

　　After being absorbed by dilute acid, trimethylamine is transferred to a headspace bottle and sealed after treatment. Under certain temperature conditions, trimethylamine in the sample in the headspace bottle evaporates into the liquid space, generating vapor pressure. After the gas-liquid phase reaches thermodynamic dynamic equilibrium, trimethylamine in the gas phase is separated by gas chromatography and detected using a hydrogen flame ionization detector/nitrogen phosphorus detector. Qualitative analysis based on the retention time of chromatographic peaks and quantitative analysis using external standard method.

　　4 Interference and elimination

　　Under the recommended analytical conditions of this method, ammonia, methylamine, dimethylamine, ethylamine, diethylamine, and triethylamine can be effectively separated from trimethylamine without interfering with the determination.

　　Name: HH-Tamine30 trimethylamine capillary column

　　Specification: 30m * 0.32mm * 5.0um

　　*High operating temperature: 280 ° C

　　No.: 20230930003