Sulphates refers to a group of minerals in which sulphate SO4 is an important part.
Salts and esters of sulphuric acid; for sulphites (maximum limits for sulphur content in wine) see sulphurous acid.
Foaming agents found in industrial cleaning products as well as cosmetics, usually known by acronyms eg. SLS and SLES. Irritants believed to denature proteins and therefore degenerate cell membranes.