Gradko International Ltd products

Nitrogen dioxide diffusion tubes provide long-term monitoring options with detection limits in the low parts per billion to parts per million range. These cost effective devices do not require specialist skills or time commitment and therefore give the user an efficient method for air quality monitoring.

Volatile organic compounds (VOCs) in the range C2-C28 can be measured using a variety of sorbents to meet the specific applications required by the customer. Polyaromatic hydrocarbons (PAHs) can also be measured using a specific sorbent.

This tube can simultaneously measure a range of acid gases – Hydrogen fluoride, Hydrogen chloride, Nitric acid, Hydrogen bromide, Phosphoric acid and Sulphuric acid (HF, HCl, HNO3, HBr, HPO4 and H2SO4).

Ammonia diffusion tubes are suitable for long-term monitoring of ambient Ammonia pollution (sampling times are 2-4 weeks). These Ammonia samplers are simple to use, requiring no specialist skills or power supply, making them an efficient monitoring option. With very low detection limits (in the low parts per billion range), even low levels of Ammonia pollution can be identified.

The largest emissions of Formaldehyde are associated with its manufacture and subsequent use, natural emissions are lower. This tube is used for active (pumped) sampling over a few hours to identify levels of Formaldehyde and other Aldehydes. Concentrations can be measured in the low parts per billion (ppb) range and above.

Hydrogen sulphide (H2S) pollution is associated with an unpleasant odour, as are many other pollutants.

Ozone tubes are Palmes-type diffusion tubes used for long-term monitoring over 2-4 weeks. Ozone can be detected in the low parts per billion to low parts per million ranges. Specifically designed for Ozone absorption, the tubes are inexpensive and require no specialist skills or training, an ideal air monitor for large areas or for long-term studies.

Ambient air monitoring using our Sulphur dioxide diffusion tubes is a simple means of monitoring that requires no further maintenance after installation – an easy, cost-effective method. These Palmes-type tubes are designed for long-term monitoring, and offer measurement of Sulphur dioxide in the low parts per billion to parts per million range.

PVC is one of the most widely used thermoplastic materials due to its preferential characteristics at a highly competitive price. The transparency of PVC materials allow continual visual monitoring of fluid flow and identification of bubbles. Properties of excellent acid and chemical resistance help to maintain the sterility of solutions. PVC tubing can also withstand high pressure contents and has a glass smooth bore, reducing the coefficient of friction.

Solva forms part of Gradko’s range of small bore tubing to meet a wide variety of applications. Its solvent resistant characteristic allows it to be used for aromatic oils, solvents, petroleum compounds, inks and many other applications. It is also phthalate-free, meeting the modern requirements of tubing under REACH regulation.