In this research work, the performance of the measurement system (TDLAS) has been improved, it was connected to the computer for acquisition and processing data using the programming language MatLab. The internal surface of the cavity was coated by p
araffin wax, adsorption is significantly lowered.
This system has been employed to measure the concentration of ammonia in exhaled breath for 20 healthy volunteers in two cases (fasting and non-fasting), and 36 volunteers with chronic renal disease (before hemodialysis).
This study aimed to estimate the level of air pollution in some portable heavy metals
in dust quarries by needles of Pinus brutia Ten. as biomonitor In site of Kfardabeel Stand-
Jableh. The samples of dust and leaves were collected at the end of Ju
ly in 2016, Atomic
absorption spectrophotometer was used to determine the amounts of Lead, Zinc, Nickel
(ppm, dry weight).
The average of accumulated metals in the needles were estimated: (Pb= 45.57 ppm,
Zn= 13.64 ppm, Ni= 7.64 ppm), while their amounts in the dust were done as following:
(Pb= 66.1 ppm, Zn= 15.8 ppm, Ni= 19.6 ppm). The results showed that the studied site is
polluted with Pb and Ni whereas Zn is in the natural range. a strong correlation between
heavy metals amounts in the needles and their amounts in the trapped dust (r= 0.98) was
detected, also regression equations have explained the variations in accumulation of
studied metals in relation to the accumulated dust on needles as following: 40% Pb, 40%
Zn, 20% Ni. Consequently results confirmed the possibility of detecting the atmospheric
Pb, Zn, Ni pollution in the studied site using P. brutia Needles as a biomonitor.
The aim of this study was to determine the trace of some heavy metals elements pb,
Cd, Cu, Zn & Fe in the leaves and periderm of the Avundodonax L. using Atomic
absorption spectroscopy. The samples were collected from twenty locations and divided
into four groups according to traffic and human activities.
The results showed an excess in the concentration of lead, cadmium and copper in
the leaves and periderm of the Avundodonax L., which enables the use of this plant as a
vital indicator for the pollution by these heavy metals. The concentration of cadmium in
the leaves and periderm ranged between (0.231- 6.278ppm) and for lead between(1.057-
47.592ppm) and copper between(1.022 -45.771ppm). While the concentration of both zinc
and iron remained within the permissible natural limits.
