HJ 644-2013 Analysis of volatile organic compounds in ambient air Thermal desorption&GCMS-Panyu Instruments Co.,Ltd.

HJ 644-2013 Analysis of volatile organic compounds in ambient air Thermal desorption&GCMS

Time:2023.02.15

Publisher:Admin

Number:2614

2023.02.15

Admin

2614

Abstract

Referring to "HJ 644-2013 Analysis of Volatile Organic Compounds in ambient air", 35 kinds of volatile organic compounds were detected by Thermal desorption&GCMS, and the standard volatile organic compounds were qualitatively and quantitatively by external standard method according to retention time, mass spectrometry and characteristic ions.

1. Configuration scheme

2 Test the conditions

Injection method: automatic thermal desorption instrument

Injection mode: Split;Split ratio: 5:1

Column: RTX-624, 60m×0.25mm×1.4μm constant-current mode column flow: 1ml/min

Column Oven heating procedure: 30℃ (3.2min) 11℃/min 200℃ (10min)

Sampling port: 200℃; Ion source: 230℃; Transmission line: 250℃;

Solvent delay: 6min;

SCAN mode: Full scan (SCAN) or select ion (SIM); Scanning range: 35~350amu.

3、Test results

3.1 Qualitative results of volatile organic compounds

Figure 1 Standard spectrum of 100mg/L volatile organic compounds

3.2 Overlapping spectra of standard samples of different concentrations

FIG. 2 Superimposed spectra of different concentrations

4. Calibration curve results

Formulate a calibration series of 5 concentration points, respectively 5mg/L, 10mg/L, 25mg/L, 50mg/L and 100mg/L.Perform ion scan tests from low concentration to high concentration in sequence according to the test conditions in Article 2.With the concentration of the target compound as the horizontal coordinate and the quantitative ion response value of the target compound as the vertical coordinate, the calibration curve is drawn. The linearity of both reaches 995 or above. The specific results are as follows.

Table 1 Linear results of volatile organic compounds