4.2.6.1 Reference conditions for instrument operation of TDI:

　　a) Chromatographic column: 2m×4mm, OV-17: QF-1: Chromosorb WAW DMCS = 2:1.5:100;

　　b) Column temperature: 180℃;

　　c) Gasification chamber temperature: 270℃;

　　d) Temperature of the testing room: 270℃;

　　e) Flow rate of carrier gas (high purity nitrogen): 100mL/min.

　　4.2.6.2 Reference conditions for instrument operation of MDI:

　　a) Chromatographic column: 2m×4mm, OV-17: QF-1: Chromosorb WAW DMCS = 2:1.5:100;

　　b) Column temperature: 230℃;

　　c) Gasification chamber temperature: 290℃;

　　d) Temperature of the testing room: 290℃;

　　e) Flow rate of carrier gas (high purity nitrogen): 100mL/min

　　​

　　This part of GBZ/T 300 specifies the solution absorption-gas chromatography method for the determination of toluene diisocyanate (TDI) and methylene diphenyl diisocyanate (MDI) in the air of the workplace, and the solvent elution-liquid chromatography method for the determination of isophorone diisocyanate (IPDI).

　　This section is applicable to the detection of the concentration of methyl benzoate, diphenylmethane diisocyanate, and isophorone diisocyanate in the air of the workplace.

　　4.2.6.1TDI 的仪器操作参考条件:

　　a) 色谱柱:2m×4mm，OV-17:QF-1:Chromosorb WAW DMCS = 2:1.5:100；

　　b) 柱温:180℃；

　　c) 气化室温度:270℃；

　　d) 检测室温度:270℃；

　　e) 载气(高纯氮)流量:100mL/min。

　　4.2.6.2MDI 的仪器操作参考条件:

　　a) 色谱柱:2m×4mm，OV-17:QF-1:Chromosorb WAW DMCS = 2:1.5:100；

　　b) 柱温:230℃；

　　c) 气化室温度:290℃；

　　d) 检测室温度:290℃；

　　e) 载气(高纯氮)流量:100mL/min

　　​

　　GBZ/T 300的本部分规定了工作场所空气中甲ben二异qing酸酯（TDI）和二苯基甲烷二异qing酸酯（MDI）的溶液吸收-气相色谱法，异佛尔酮二异qing酸酯（IPDI）的溶剂洗脱-液相色谱法。

　　本部分适用于工作场所空气中甲ben二异qing酸酯、二苯基甲烷二异qing酸酯和异佛尔酮二异qing酸酯浓度的检测。