Sig Nitrite

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WHAT IS THE TEST USED FOR?

The Sig Nitrite Test is used to detect the presence of nitrite reducing microorganisms, which degrade nitrite based corrosion inhibitors in cooling waters.

WHAT IS THE TEST?

The test consists of a screw capped glass tube half filled with a selective microbiological culture medium that indicates the presence of nitrite reducing micro-organisms in an aqueous sample by changing colour from ORANGE to PINK and also by producing gas bubbles. Sample is added to the test bottle which is kept warm (or incubated) close to 30oC for up to seven days.

WHAT CAN I TEST WITH THE SIG NITRITE TEST?

• Cooling waters
• Metal working Fluids
• Effluents
• Sewage
• Any water which contains a nitrite corrosion inhibitor.

WHAT ARE THE ADVANTAGES

• Quick, easy and safe to use
• Heavy infections can be detected after overnight incubation
• Simple to read results
• Results are semi quantitative and give an indication of the severity of an infection
• Cost effective method of monitoring for Nitrite Reducing Bacteria on-site.

WHO CAN USE THE TEST?

Full instructions are supplied and no special training is required to use the Sig Nitrite Test.

BACKGROUND INFORMATION

Nitrite is commonly used as a corrosion inhibitor in cooling water and some metalworking fluids. Some microbes, which normally use atmospheric oxygen, have the ability to switch to nitrite as an oxygen source when fluids become stagnant. The nitrite is reduced to ammonia or nitrogen gas and the fluid rapidly becomes corrosive. The Sig Nitrite test has been designed to detect these microbes. Sig Nitrite tests can also be used to confirm that de-nitrification is taking place in effluents, sewage etc.

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