I am now grinding my samples for posteriori stable isotope analysis (C,N and S). 

I have found salt crystals on some of the zooplankton samples , and I would like to know if there is an effect on the isotopic signatures. Checking on the literature I have found a paper (Banaru et al, 2014), were they remove the salt manually and at least they don’t mention any issue about it. 

However, I want to investigate more on this to know if there is an effect , otherwise I will have to dissolved all my samples and dry them again, which is going to be super time consuming. 

Why is there salt in the samples? Zooplankton was sampled and categorised according to size classes (63 to 2000 µm). For the smallest size class (63µm), as the mesh is very small, there was some water left on the sieve, and while drying, water evaporated and salt remained on the sample. 

Thank you for your help!