A very simple to use test kit, for you to use in the home. The equipment is deployed in your home and is allowed to sit and take in gases for diffusion, for between 2 and 4 weeks.
After which time it is sent to the laboratory where it is analysed for hydrogen sulphide. The lod ( limit of detection is of the order of the low parts per billion)
H2S Has an unpleasant “rotten egg” smell, usually when the concentration is at or above the 5 micrograms/m3. The WHO (World Health Organisation) Sets a limit of 7micrograms /m3 as a 30min average. Above this level authorities would expect to receive significant complaints
Can cause :
The lowest adverse effect of H2S as reported by the WHO, tends to occur in concentrations above 15mg/m3 ( around) 10 ppm)
For further information of tube monitoring and new real time remote monitoring products, please contact
Tech sites which refer to indoor air quality (iaq), draw us into is an emotional argument. These reports tell us of dangerous pollutants that surround us. Which can cause us serious harm. This is why we need the ….”Z box”
The “Z box ” will measure 8 zillion components all to within the accuracy of a nats breath.
Which is real terms means ……absolutely nothing
No one ever brings up a WHO standard. Or even mentions calibration, testing or accuracy.
Recently i came up across a client who had purchased a HEPA ( High Efficiency Particulate Air Filter) combined with a charcoal filter in order to provide workers in the office space with confidence that the air was clean and filtered.
There are a number of issues with this. Whilst some HEPA filters are good many operate on the edge of being useful to achieve this level of particle size removal. Typically a HEPA system operates at 0.3micron , a corona virus size is of the order of 0.1micron (100nm). However when the virus associated with an aerosol the filter can provide some useful reduction of the aerosol with associated. Independent assessment of these systems in vital to their correct use
We would not buy children’s medicine from the chap in the market, who has no credentials, however its perfectly reasonable to make random internet purchases on goods which are supposed to be good for our health.
note references made are always about “style”, “size” “looks” and “features” but not a jot about how it is tested and whether it really works!
When monitoring indoor air quality (IAQ), it is important before we pick up any piece of monitoring equipment, that we have a method and protocol to tell us what we are monitoring, how and where we sample and with what equipment.
There are a number of good iaq guides which have devolved from ASHRAE, there are also indoor air quality specification with part F of the building regulations
We recommend as a basic monitoring scheme that the following would be need to be monitored,