5 Analysis Test

5.1 Analysis process

（1） Sample processing

The total mass of the weighed sample is:0.5-1.0 mgFix the sample in the middle of the quartz tube with tweezers and secure both ends with quartz wool; Add the liquid sample directly onto the quartz wool. Then put the quartz tube into the heating device.

（2） Reference conditions

1) Cracking program temperature rise:100℃→（72℃/min）→280℃(2 min)

2) Transmission line temperature:300℃

3) Sample diversion injection: Solid injection weight required≤ 1.5mg, Liquid≤1 ul

4) FIDDetector temperature:300 ℃, injection port temperature:300 ℃

5) temperature-programmed 100 ℃ (maintain) 1 Minute by minute 20 ℃ rises to 300 ℃ (maintain)14Minutes)

（3） Reference results

Reference retention time and time window for each component of phthalate ester compounds

Reference chromatogram of standard reference materials for phthalates

5.2 Standard curve and linear range

The configuration content is50 ppmThe100 ppmThe250 ppmThe500 ppmand1000 ppmofDBPDraw a standard curve using the peak area of the quantitative component as the y-axis and concentration as the x-axis for the standard solution.

The standard curve and linear correlation coefficient are as follows:

The comparison of peak areas of different concentrations of standard solutions is shown in the following figure:

According to the baseline noise2The minimum detection limit for signal doubling calculation is approximately50 ppm.

5.3 repetitiveness

The repeatability of the sample was determined, and the results are as follows:

The minimum detection limit is approximately50 ppmThe linear correlation coefficient is greater than0.999，RSD≤5.16%SatisfyRoHS 2.0Screening requirements for ortho benzene.

6 working environment

1) Environmental Requirements

The operating temperature is15°C～35°COptimal operating temperature18°C～28°C，1.5hThe internal temperature change is not greater than2°CDue to the large temperature difference in the environment, air conditioning should be installed.

The relative humidity must be within ≤75%Can be equipped with a dehumidifier.

Operation and storage require a non condensing and non corrosive environment.

The maximum dust particle density is80mg/m³.

2) Electrical requirements

Voltage range:220V±10VThe frequency is50Hz.

The power supply has a grounding wire; No strong electromagnetic interference.

have10AInsert board for three pin plug3One.

If funds permit, it is recommended to install an uninterruptible power supply（UPS）Power requirements10KVAThe above.

3) Requirements for instrument installation test bench

Provide sufficient laboratory space for installationPYTheGCThePCDevices such as printers.

The experimental platform must have a flat surface and be stable enough to support the weight of the entire system, includingPYTheGCThePCEquipment such as printers, with a total weight of approximately120kg.

Leave no less than around the experimental platform0.5mPlease do not place it against the wall due to the wide operating and maintenance space.

Suggest installing exhaust equipment above the experimental platform.

Suggested size for instrument installation laboratory bench: length250cm×wide80cm×high75cm.

4) Requirements for sample processing test bench

The sample processing experimental platform is mainly used to place electronic scales and perform sample processing.

The sample processing experimental platform should be stable and durable, and reduce the generation of vibration.

Electronic scales should not be placed near ventilation openings or fans, as strong airflow can affect the weighing results.

The sample processing experimental platform should also have sufficient space for sample processing.

Suggested size for sample processing experimental bench: length120cm×wide80cm×high75cm.

If space is limited, two long instrument installation and sample processing test benches can also be used150cmThe experimental table.