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.
Direct high sensitive spectrophotometric method for determination
Ni(III) has been suggested . proposed method is based on the
formation of red- win colored complex between Ni(III) and DMG
reagent in strong alkaline media of NaOH ,pH=12.5.the formed
complex absorbed electromagnetic radiation at 465nm .
Partial veneer crown has appeared to prevent the excessive preparation of
dental tissue with complete crown and the major reason success of this prosthesis could be strength of
cementation.
Therefore the latest studies have been focusing on develo
ping new material and technique to increase the
bonding strength and using new technique for surface treatment or change type of metal alloy.
The aim of this search is to study the bonding resin cement strength to different type of metal alloy due to
surface treatment.
Nickel metal may cause systemic toxicity and allergy
The compatibility of dental casting alloys correlates with
their release of elements .The aim of this study was to
specify the relationship of the release of nickel from Ni-
Cr dental alloys wi
th their composition , and to
determine the effects of thermal treatment of Ni-Cr
alloys during porcelain firing process on the release of
nickel .
Ranging Five Ni-Cr alloys commonly used in clinical
practice were used, They have different nickel
percentage Ranging between ٥٩،٣ and ٨١ % , two of
them containing beryllium .
