GBZ/T 300的本部分规定了工作场所空气中甲苯二异氰酸酯（TDI）和二苯基甲烷二异氰酸酯（MDI）的溶液吸收-气相色谱法，异佛尔酮二异氰酸酯（IPDI）的溶剂洗脱-高效液相色谱法。
本部分适用于工作场所空气中甲苯二异氰酸酯、二苯基甲烷二异氰酸酯和异佛尔酮二异氰酸酯浓度的检测。
4.2.6.1 TDI 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。
4.2.6.2 MDI 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
This part of GBZ/T 300 specifies the solution absorption-gas chromatography method for toluene diisocyanate (TDI) and diphenylmethane diisocyanate (MDI) in the air of the workplace, and the solvent elution-high performance liquid chromatography method for isophorone diisocyanate (IPDI).
This section is applicable to the detection of toluene diisocyanate, diphenylmethane diisocyanate, and isophorone diisocyanate concentrations in the air of the workplace.
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
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