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What is this huge peak on the left of fluorescence spectra

Akeda104
in Applied Chemistry

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Image is given below, for blank (H2SO4, 5%) and for 10ppm quinone sulfate Screenshot_20190223-100818.thumb.jpg.4598d758a283fc62d47eae23c3d18866.jpgScreenshot_20190223-101252.thumb.jpg.7ffbdc3f733c93682987321bcccde279.jpg

It is the limit of your device and probably also the material of your quarz cuvette. It  is in UV value.

2 hours ago, chenbeier said:

It is the limit of your device and probably also the material of your quarz cuvette. It  is in UV value.

I doubt that.

360nM is well within the transmission range of most glass, never mind fused quartz.

 

My guess is that it's scattered light from the excitation light.

 

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