Dithionite

high-resolution terminology - matching measurements at high-resolution

Dithionite

Description

Zero oxygen solution powder, Na₂S₂O₄, used for calibration of oxygen sensors at zero oxygen, or for stepwise reduction of oxygen concentration in instrumental O₂ background tests.

Abbreviation: Na₂S₂O₄

Reference: MiPNet06.03 POS-calibration-SOP, MiPNet14.06 Instrumental O2-background

MitoPedia methods: Respirometry 

Preparation

Preparation of 10 mM Dithionite solution for Instrumental Background (dissolved in Phosphate buffer, 50 mM, pH 8)

1. Weigh 0.017 g Dithionite, sodium hydrosulfite, and transfer to 10 mL volumetric glass flask.
2. Adjust final volume to 10 ml with Phosphate buffer and keep closed to avoid decomposing.

Note: Sodium dithionite cannot be stored for a long period of time, because it is slowly oxidized by air when in solution. Even with the absence of air, solutions of sodium dithionite deteriorate. Therefore when Dithionite is open for a long time, we use a concentration of 30 mM for the Instrumental Background. The experiments showed the identical results with 10 and 30 mM Dithionite stock.

• From MiPNet06.03 POS-calibration-SOP (Version 14): Prepare "zero solution" by dissolving c. 20 mg sodium hydrosulfite (OroboPOS-Service Kit) or two tips of a spatula in 0.5 ml of water. Mix in a small vial with minimum gas space. Use fresh. Dithionite may not work after prolonged storage.

Further information »Talk:Dithionite