Spanish to English Science Chemistry; Chem Sci/Eng

I'm proof-reading a scientific text, written in English, but by a Spanish person, and I think they've used punctual in its false friend capacity!
"Thus, although most HPLC separations are carried out using UV detection due to its ease of use, owing to its poor limit of detection (LOD), the resulting HPLC method can be unsuitable for the determination of the analytes in the addressed sample and therefore, labelling becomes a necessary procedure. This situation is not punctual, and thus labelling techniques are widely used in HPLC and have long been accepted as a method of choice for enhancing the sensitivity and/or selectivity for the overall process"

I gather they mean that it's not one-off, or something that is only applicable now and again, but I'm having trouble making it sound neat in English.
Any ideas?
cheers