How do chemists measure the amount of antimony in a sample?

Chemists employ several analytical techniques to measure the amount of antimony in a sample, primarily through gravimetric and volumetric methods:

• Gravimetric Analysis: Antimony can be separated and weighed in the form of its sulfide, ${\text{Sb}}_2{\text{S}}_3$. Alternatively, the sulfide can be converted into the oxide and, following careful ignition, weighed as ${\text{Sb}}_4{\text{O}}_6$.1
• Volumetric Analysis: There are numerous volumetric methods available, which often involve oxidizing antimony that is in the $+3$ oxidation state using reagents such as potassium permanganate, potassium bromate, or iodine.1
• Modified Gutzeit Method: In instances where arsenic is absent, small quantities of antimony can be determined using a modified version of the Gutzeit method.1