Sulphate is an alternative form of sulfate.
As nouns the difference between sulphate and sulfate
is that
sulphate is (british|chemistry) while
sulfate is (organic chemistry) any ester of sulfuric acid.
As verbs the difference between sulphate and sulfate
is that
sulphate is (british|chemistry) while
sulfate is (chemistry) to treat something with sulfuric acid, a sulfate, or with sulfur dioxide.