Methods and apparatuses for identifying contaminants in a semiconductor cleaning solution, including: contacting a semiconductor cleaning solution with a semiconductor manufacturing component to form an effluent including one or more insoluble analytes-of-interest; contacting the effluent including one or more insoluble analytes-of-interest with an optical apparatus configured to sense fluorescence and, optionally, Raman signals from the one or more insoluble analytes-of-interest, wherein the apparatus includes an electron multiplying charged couple device and a grating spectrometer to spectrally disperse the fluorescence and project the fluorescence on to the electron multiplying charged couple device; and identifying the one or more analytes of interest.