…er liter Water None None None < 35 microns None None USGS use and no use by EPA 32273 Pheophytin a <35,phyto,fluoro ug/l BIO Pheophytin a less than 35 microns, 35-um sieve prefilter, phytoplankton, fluorometric method, micrograms per liter Water None None None < 35 microns None N…