Could you give a few details about your experiment set-up (e.g. concentrations analysed, method used etc.?)
Carry over in HS is mostly a consequence of bad temperature choice. Also the implementation (syringe, sample loop, pressure balance) of the technique has a great influence on possible carry over site's. A dirty needle will cause carry over in all implementations while a mis aligned needle will cause problems in a pressure balanced system. Also for your sample the system needs to be base deactivated.
First do a system validation with a ethanol water mix if this is ok the problem is sample related meaning temperature; flow's or deactivation, if the validation fails do a profound system maintenance
System calibration is OK. Also other analysis give nice result, but when it comes to TEA then there is carry over and area variation in multiple injections.
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