Sea spray aerosol plays an important role in climate and atmospheric chemistry, yet sea salt is rarely quantified by online mass spectrometers due to its refractory nature. This study shows that a capture vaporizer time-of-flight aerosol chemical speciation monitor can detect sea salt aerosol using Na and NaCl fragments. Laboratory and field results demonstrate robust real-time measurements of NaCl surface area, while accurate mass concentrations require particle size information.