Does sodium sulfite calibration?

Sodium sulfite is a scavenger thus should remove any dissolved oxygen from the water within 15 minutes. Cobalt chloride is a catalyst for the reaction thus its addition makes the solution good to use within several minutes. Calibration is simply performed by immersing the DO sensor tip into the liquid standard.

How do you make sodium sulfite solution?

Preparation. Sodium sulfite can be prepared by treating a solution of sodium hydroxide with sulfur dioxide. When conducted in warm water, Na2SO3 initially precipitates as a yellow solid. With more SO2, the solid dissolves to give the disulfite, which crystallizes upon cooling.

How do you calibrate a dissolved oxygen sensor?

To calibrate a Hydrolab LDO sensor using the % saturation method fill the calibration cup so that the temperature sensor and the LDO sensor are submerged in water that is 100% air-saturated. Make sure the temperature of the water is stable and at equilibrium with the air temperature.

How do you make a zero oxygen solution?

A zero DO solution can be prepared by dissolving 1 g or more of sodium sulfite (Na2SO3), an oxygen scavenger, with 1 L of distilled or deionized (DI) water in a container. This solution should be freshly prepared and the volume should be enough to cover the membrane and temperature sensor.

When to use sodium sulfite for zero point calibration?

Flow gas past the sensor for at least 5 minutes prior to initiating any zero point calibration. This ensures that any residual oxygen is fully purged from the tubing. If gas calibration is not feasible then a simple liquid solution can also be used. Mix 1 gram sodium sulfite (Na 2 SO 3) with 100 mL of distilled water.

How to prepare sodium sulfite for dissolved oxygen probe?

Sodium Sulfite Calibration Solution The 2.0 M sodium sulfite (Na 2 SO 3) calibration solution can be purchased (order code DO-CAL). But it can also be prepared from solid sodium sulfite crystals: Add 25.0 g of solid anhydrous sodium sulfite crystals (Na 2 SO 3) to enough distilled water to yield a final volume of 100 mL of solution.

Who is the manufacturer of sodium sulfite solution?

Safety Data Sheet SODIUM SULFITE SOLUTION 1 Section 1 – Product and Company Identification Product Name: Sodium Sulfite Solution Chemical Formula: Na 2 SO 3 CAS Number: 00777-83-7 General Use: Waste water dechlorination agent, lab reagent, reducing agent Manufacturer: INEOS Calabrian Corporation 5500 Hwy. 366

Do you need reagent grade sodium sulfite crystals?

The sodium sulfite crystals do not need to be reagent grade; laboratory grade will work fine. Prepare the solution 24 hours in advance of doing the calibration to ensure that all oxygen has been depleted.