China Education Equipment Purchasing Network News: Recently, Shanghai Shunyu Hengping Scientific Instrument Co., Ltd. released a solution for the analysis of plasticizers in food by mass injection-gas mass spectrometry in response to food contamination by plasticizers. Among the specific solutions , The company listed two parts, namely sample preparation and large volume injection-GC-MS analysis.
Large-volume injection-mass spectrometry analysis of plasticizers in food solutions mainly includes two parts: sample preparation and large-volume injection-gas-mass spectrometry analysis.
There are certain differences in the pretreatment of samples according to the different substrates (refer to the extraction method in GB / T21911-2008). After the samples without oils and fats are added to cyclohexane and shaken for extraction, the supernatant can be taken by centrifugal separation Perform GC-MS analysis; samples containing oils and fats must be purified by GPC after extraction before GC-MS analysis.
Large volume injection (LVI) is one of the gas chromatography injection methods. Compared with the conventional injection method, the injection volume can be increased by tens to hundreds of times, which further reduces the detection limit. The concentration step after GPC purification can also be omitted, and the same sensitivity as the conventional method can be obtained by increasing the injection volume.
JEOL's JMS-Q1000GC gas-mass spectrometer uses a large-scale high-precision quadrupole and a high-speed turbomolecular pump. While ensuring excellent sensitivity and high resolution of the instrument, it can work stably for a long time and obtain reliable analysis results.
The vacuum system is the main factor that determines the performance of the mass spectrometer. The degree of vacuum determines the sensitivity and stability of the instrument. The JMS-Q1000GC gas-mass spectrometer is equipped with a high-speed turbomolecular pump of 400L / s and adopts a differential pumping method to keep both the ion source and the quadrupole in a good high vacuum environment. In addition, the additional helium purge gas flow can take away the components that are difficult to evacuate from the cavity, further ensuring that the instrument quickly reaches and maintains a stable high vacuum environment for a long time.
Due to the use of classic metal quadrupole, JMS-Q1000GC has a good match in the standard library search qualitative, which is very beneficial for the qualitative confirmation analysis of phthalate esters.
In addition, the unique quadrupole temperature control component of the JMS-Q1000GC gas mass spectrometer can accurately control the stability of the quadrupole temperature, avoid the influence of the high-speed change of RF voltage on the temperature of the quadrupole, and ensure the stability of the analysis results.
This scheme adopts JMS-Q1000GC gas-mass spectrometer and LVI-S200 large-volume injector, which greatly improves the detection sensitivity of GC-MS and ensures the stability and reliability of the experimental results.
In addition, the instrument configuration is divided into three steps, as follows:
UV detector
Manual injector
Automatic fraction collector
GPC purification column is equipped with LVI-GC-MS analysis and detection part JMS-Q1000GC gas-mass spectrometer (JEOL company) according to the sample matrix.
Quadrupole mass analyzer with EI source
With quadrupole temperature control components
Automatic power supply, automatic transformer
GC / MS software, data workstation, quantitative software
NIST08 spectral library
With stomach bag liner
Using a Home Composting Machine is a simple and efficient way to reduce food waste and create nutrient-rich compost for your garden.
Compost Making Machine For Home,Food Waste Disposers,Composting Equipment For Home,Compost Shredder Machine
Ningbo Ifilter Purification Equipment CO.,Ltd. , https://www.nbifiltor.com