As per the guidelines of US environmental protection agency (EPA Method 180.1) why the distance between source and detector should be within 10 cm for nephelometric turbidity measurement at 900 scattering angle.
The 10 cm distance there is put, so the readings of your nephelometric trubidimeter will not be significantly different from existing ones, since mostly they are small and use sample tubes. Note, that the standard was written in 1993 when people were not using automated turbidity loggers. And when you are use this one, you want you sampling space to be a little bigger, so it will not get filled with sediments very quickly. Also note, that ISO standard for nephelometers is different. Another consideration is that this standart is about measuring turbidity mostly in NTU, since only one detector on 90 degree angle is required, however there are new turbidimeters using NTRU units, with 3 detectors.
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