第一段Hot-injection system with sample splitter The instrument shall have a variable-temperature injection block with a sample splitter. The injectiontemperature shall be capable of being set to an accuracy of 1 °C. The split ratio shall be adjustable and capable of being monitored. The sample splitter insert shall contain silanized glass wool to retain non-volatile constituents, and shall be cleaned and provided with new glass wool packing or replaced as required to ruleout errors due to residues of binder or pigment (i.e. adsorption of compounds). The occurrence of adsorptionis revealed by peak tailing, in particular with components of low volatility. 第二段Cold-injection system with sample splitter The cold-injection system shall be provided with temperature programming for heating from ambient to 300 °and shall have a sample splitter inlet which is made of an inert material such as glass. The sample splitter shall be provided with silanized glass wool packing and shall be maintained as specified in 6.2.2. The splitratio shall be adjustable and capable of being monitored. Method precision will be increased if the injection system,especially the hot-injection system, is coupled to an auto-injector. The manufacturer's instructions shall be followed when an auto-injector is used.
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