@article{MAKHILLJEAS2017121414626,
    title = {CO<sub>2</sub> Laser Photoacoustic for Measuring NH<sub>3</sub> Gas Concentration on Exhaled Breath of Scavengers on Landfill},
    journal = {Journal of Engineering and Applied Sciences},
    volume = {12},
    number = {14},
    pages = {3687-3691},
    year = {2017},
    issn = {1816-949x},
    doi = {jeasci.2017.3687.3691},
    url = {https://makhillpublications.co/view-article.php?issn=1816-949x&doi=jeasci.2017.3687.3691},
    author = {Fitri,Rizky,Wahyu and},
    keywords = {Spectro meter,scavengers,photoacoustic,occured,concentration},
    abstract = {A CO<sub>2</sub> laser photoacoustic spectrometer intracavity configuration has been built and tested. The
application was for determining the NH<sub>3</sub> gas concentration on exhaled breath of scavengers on the Landfill. The 
off-line experiment was conducted through non-invasive sample method using exhaled breath. Exhaled breath
sample was taken by three daily variations of the morning, mid-day and post-day. The data was analized by
multicompound gas method using the software of excel, origin and scilab. The result from the photoacoustic
spectrometer intracavity configuration with the strongest frequency resonance(1650&plusmn;5) Hz at biomarker gas
occured on absorption lines 10R14, 10P14 and 10P16. The lowest detection boundary from ammonia is
(23.3&plusmn;0.5) ppbV. The highest ammonia concentration from scavengers was (2904&plusmn;1) ppbV occured in the early
morning and the lowest concentration was (1089&plusmn;1) ppbV in the post-day. Meanwhile, on healthy volunteers,
the highest ammonia concentration was (1676&plusmn;1) ppbV in the morning and the lowest ammonia concentration
was 377&plusmn;1) ppbV in the mid-day. It shows the contamination of air ambien caused the increasing concentration
of biomarker gas in the human body.}
    }