noble gases comprise a group of elements consisting of helium , neon , argon , krypton , xenon and radon , which show essentially no chemical reactivity under regular conditions , e . g . room temperature even in a mixture with chlorine gas . theoretically speaking all noble gases can be used for mixing with chlorine for the microorganism control . in reality , the suitability of each noble gas is determined by its density , availability and cost as shown in table 1 . in order to make a mixture that is physically stable during storage and use , a noble gas is required that has a comparable density to chlorine . if the noble gas is too light , then it will create a blanket close to the ceiling in a closed system , preventing chlorine access to the ceiling . likewise , if the noble gas is too heavy , then the floor will be shielded from chlorine . the cost of the noble gas is another important factor when this mixture is to be commercialized . from table 1 , it can easily be appreciated that argon is the best candidate , with neon in the second place and less preferable . argon and chlorine are the preferred mixture . argon and chlorine gases can be stored in separate commercial containers of appropriate material , e . g . steel tanks , equipped with calibrated dials on their release valves . when the agent is to be applied , the mixture can be generated by passing the gases from the high - pressure containers through their respective pressure regulator into a mixer . a representative design of the mixer can be a y - shaped tube . one side is the two arms , each of which connects to one gas supply and the other side is one stem , which directs the mixed gases into the air for dispensing purpose . a representative size of the y - shaped tube is 0 . 5 inch long for each of the two arms , and 1 inch long for the stem and the size can be increased or decreased according to need or convenience . the mixer can be made of any material that has sufficient strength and chemical resistance to corrosion from chlorine . a few of the exemplar materials are monel , which is a mixture of copper and nickel , nickel itself , or stainless steel . a preferred material is teflon ( dupont ). teflon material possesses outstanding chemical resistance to chlorine and is lightweight compared to metal or metal alloys . a suitable device , e . g . a baffle , can be installed in the stem to promote efficient mixing . the amount of chlorine gas and the ratio of argon to chlorine can be varied according to need . for example , to clean a room 20 ft long , by 20 ft wide , by 10 ft high using the gas mixture of the invention , 20 cubic feet of chlorine , 400 cubic feet of argon , which accounts for a ratio of argon : chlorine at 20 : 1 ( or 5 % chlorine ) can be utilized . even levels of 1 - 3 % of chlorine can work very effectively . if virus on an exposed surface is the target , as little as 0 . 1 to 0 . 2 % of chlorine could be enough . however , it is possible to increase the level of chlorine so that the chlorine is present in an amount of up to 25 % of the total mixture of chlorine and argon , especially in cases of emergency situations . the mixture chlorine and argon (“ chloragon ”) can be sprayed into the site of the microorganisms , such as bacteria , virus , spores and even where termites or mice are the problem or where black mold is present . the fact that it is in a gas form makes it possible to quickly and deeply penetrate even the smallest cracks and crevices of the enclosed area and particularly where the organism may linger to recontaminate later if the conventional method or physical removal are used . the fact that chlorine is denser than air ( about 0 . 0012 g / cm 3 at 1 atmosphere , and 20 ° c .) helps keep chlorine in the crevices and on top of the floor for a longer period of time for higher efficiency . it is to be noted that the space needs to be enclosed and maintained closed for the duration of the treatment in order to maintain the concentration of chlorine substantially constant and avoid its diffusion into the atmosphere , whereby the organisms or microorganisms contained in the closed space can be destroyed . therefore , the doors , windows and other openings need to be closed or taped shut , and the ventilation system also shut off during the application period . the length of the period can be varied depending on the target , the chlorine concentration , the volume of the mixture released , etc . in order to kill a virus exposed on a surface with chloragon , one or two hours should be enough in most cases . while if the target is a spore former , such as anthrax , one or two days may be necessary . it may be necessary to install an alarm or detection system to detect malfunction in the chlorine - argon systems and for determining chlorine residuals . due to the toxic effect of chlorine at relatively high concentration in the air , any person , pets , plants or other living organisms should be kept from the room or building before the site is fumigated with the chloragon gas mixture and thorough ventilation is necessary afterwards before the inhabitants return . in typical conditions , one or two hours should be sufficient for ventilation . a fan can be used to expedite the ventilation since neither argon nor chlorine is flammable by electrical sparking . chlorine is a very reactive element and undergoes reaction with a wide variety of other elements and compounds . it reacts directly with most metals and many chemicals , with the exception of nitrogen , oxygen , air and carbon . chloragon should not be applied during humid days , because the moisture can react with chlorine and produce highly corrosive hcl acid . argon is a noble gas , which is obtained from air , is so - called inert and does not react with air , hcll , hno 3 , naoh , etc . the norwalk and norwalk - like viruses , anthrax , legionellae , sars virus and mold have to be attacked quickly , considering the acuteness and severity of the illnesses associated with the microorganisms in issue , and the rapid onset and communication of these illnesses . the use of the chloragon gas compositions has the advantage that it can penetrate into the empty spaces and crevices so that the microorganisms can be eliminated completely . after the decontamination by chloragon and before the site is reoccupied by inhabitants , the residual chlorine has to be completely removed through efficient ventilation , and the ventilation can be expedited by opening doors and / or windows , using fans or other exhaust means .
a noble gas - chlorine gas mixture having broad - spectrum effectiveness against bacteria , viruses , mold , fungi , algae including spore forming microorganisms , termites , roaches , mice and other organisms . the noble gas , preferably argon / chlorine gas mixture is introduced into an enclosed area where the bacteria , virus , mold , fungi , etc ., are found and allowed to remain so that the gas composition can penetrate completely into the space including cracks and crevices . after the remediation is complete , the enclosed space should be ventilated or air movement increased to disperse the remaining gas composition .