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Table?6 Other detected gases in well atmosphere, according to well atmosphere oxygen status Instead, as carbon dioxide was suspected to be present in large proportions, an Indoor Air Quality Meter IQ-410 (GrayWolf Sensing Solutions) specific for carbon dioxide was employed to test the atmosphere at [http://www.selleckchem.com/products/carfilzomib-pr-171.html see more] the deepest depth of these 11 wells at the same time as the oxygen content was measured using the EntryRAE model PGM-3000 gas monitor (RAE Systems). The results are shown in Table?7, in which wells are listed in an increasing order of oxygen content at the time of carbon dioxide measurement. Table?7 Carbon dioxide and oxygen levels in the subset of 11 wells All 10 initially low-oxygen wells had increased oxygen levels at the time of these measurements, with three of them becoming normoxic, and the initially normoxic well remained so. Carbon dioxide levels were above the range of ��50?ppm accuracy, quoted in the equipment specifications as being up to 10,000?ppm, in seven of the 10 initially low-oxygen wells that remained low-oxygen: >80,000?ppm in five, and 26,000?ppm and 65,000?ppm in the other two. Carbon dioxide levels of the three wells that were now found to be normoxic had carbon dioxide levels of 460?ppm, 490?ppm, and 2,230?ppm, while the originally normoxic [https://en.wikipedia.org/wiki/Cefaloridine Cefaloridine] well that remained so had a carbon dioxide level of 345?ppm, only slightly higher than the carbon dioxide level of 254?ppm measured in the ambient air at ground level. 4.?Discussion In this survey of agricultural shallow wells in the lower north of Thailand, one in five wells in the study area had oxygen levels that would be harmful to a person entering the well, whereas the other detected gases, carbon monoxide, hydrogen sulfide, and explosive gases, present in some wells, were not at high enough levels to pose an immediate hazard. Oxygen concentrations  to be extremely hazardous, and this condition was found in 39 (15.4%) of the total of 253 wells or in 68.4% of the [http://www.selleckchem.com/products/VX-809.html learn more] 57 low-oxygen wells. Exposure to this low level of oxygen leads to increased heart rate; disturbed respiration; impaired thinking, attention, and judgment; and reduced coordination. At an oxygen level of