Sodium benzoate (CAS 532-32-1): storage and disposal

School prep rooms and pharmacies share the same habit: sodium benzoate sits on a general shelf near food additives and dispensing stock. Keep the laboratory tub in a dry, labelled, well organised chemical store, dated on arrival and separate from food grade supplies. A pharmacy should keep the chemical stock away from the dispensing area so that an unlabelled jar is never mistaken for a pharmaceutical ingredient. It has no particular chemical partners to separate it from. Decanted portions for classes need their own labels with the full name.

Few distinctive changes mark this salt, so the container tells you more than the powder. Look for caking or damp lumps where the lid has not seated, crust around the thread, a faded label and a missing date of receipt. A tub that has been scooped with a damp spatula may have set hard in one spot. Powder that has changed colour or picked up a smell is contaminated stock. A tub topped up from a food supplier's bag has lost its identity, and the record should say so. Nobody should taste or smell a jar to check it.

By specialist collection only. It never goes down the drain or into general waste. It is normally packed in a non-regulated or low hazard laboratory pack with compatible chemicals.

How the tub is grouped matters more than how much it holds. Sodium benzoate is not classified as hazardous on the sources we checked, but it is still a chemical waste, so it goes into a lab pack with other low hazard solids and not into the bin, a drain or a skip. Say whether the jar is the original supplier tub, how much is left and whether the label is legible. A waste transfer note covers the movement, and a pharmacy may use its healthcare entry. Contaminated or unlabelled tubs are described by their possible contents.

Usually held as: solid.

Part-used bottles and full containers are both fine. Tell us the size and how many, and an estimate is enough for a first price.