Hello,
We are using the method number to identify phthalate in toys using sim and scan.

our standart containig 6 phthalates, in which 2 are DINP and DIDP, that are come of a mixture of Isomers.

The probability match that we get for each of the phthalates is only 60% at the max and that is because the fragments of this compounds are konwn to be close to each other.

Today in one of our tests we got in the area of the Didp (one of the 2 that comes as a mixture of isomers) 3 major peaks, not looking as the mixture but as separte peaks.

The library match of each of the 3 peaks showed only 6% match to the DIDP mixture, but 50% match for each of them to one form of isomer.

My question is:

Can I assume that because of the retention area, fragments,the mass and the 50% probability,that one of them is a pure isomer from the mixture and the others are also closely related ?
And because the intensity of the pure form is different from the mixture that why I get only 6% match to the mixture in the library