Total Suspended solids
This is the amount of fine particulate matter in suspension in water of size greater than two microns . It is measured by weight per volume of sample and usually quoted as mg/l.
It is similar to turbidity but provides an actual weight of particulate matter rather than a perception. TSS can encompass both organic particlate such as plankton and algae, in addition to inorganic matter such as sand and silts.
In the lab TSS can be measured by dehydrating a water sample and weighed the precipitate. In the field it is possible to measure a TSS using
infra-red radiation or microwave radiation.