Chromatography injection needle
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We use chromatography to analyze the presence of hydrogen and oxygen in chlorine gas. However, chlorine gas is corrosive; a needle can’t withstand more than about 10 insertions before it gets damaged and can no longer be used. A micro-syringe costs over 20 yuan, and 4-5 of them are needed per shift. Do anyone have any good solutions to this problem?
When it’s difficult to push, don’t force it; if there is alcohol available, you can use it to clean the area
The collected samples are first measured; sodium hydroxide is used to absorb chlorine gas, after which the samples are taken and fed into the chromatograph, which helps to protect the syringes and the chromatograph itself
I don’t quite understand, haha. Could you explain it in more detail?
If it has a self-locking mechanism, it seems to cost around $800
You need to remove chlorine first before sampling!
After each sample injection, the needle must be washed immediately; it cannot be left there waiting for the next injection. Anhydrous ethanol or acetone can be used for needle cleaning. It evaporates quickly, so it won’t have much impact on your subsequent analysis.
We’re now using a 10-port valve; it’s just slower – it takes 6 minutes to produce one peak
In our laboratory, for gas sampling, we use a six-way valve (is there a ten-way valve?) ? ) Second, BCG syringes are used, with plastic needles (the people in our laboratory call them “blue needles”), and the volume of sample injected is 1 ML.
Of course, there are ten samples. The principle is the same as that for six samples; we use a 100-microliter needle
Clean the sampling needle in a timely manner; from sampling to injection, it usually takes no more than a minute. If this time period is prolonged, corrosion of the needle will certainly occur. However, removing moisture from the gas can improve the needle’s service life