Nitric acid (3 g/L) TS, Validity: 12 months

4-Nitroaniline TS1, Validity: 12 months

1-Nitroso-2-naphthol-3,6-disodium disulfonate (2 g/L) TS, Validity: 12 months

Opalescence stock standard TS, Validity: 6 months

Oracet blue B/acetic acid TS, Validity: 12 months

Oxalic acid (0.05 g/L) TS, Validity: 12 months

Oxalic acid/sulfuric acid TS, Validity: 12 months

Perchloric acid (~140 g/L) TS, Validity: 12 months

Perchloric acid (0.02 mol/l) VS, Validity: 12 months

Perchloric acid (0.05 mol/l) VS, Validity: 12 months