Media Konservasi Vol. Desember 1989 : 45
-
50KANDUNGAN
TIMBAL
JENIS
POHON
JALAN
DI JALAN
(Lead
Content in
Leaves
of
Wayside Trees
on
Because automobiles emitted lead particles, plants grown a t various distances from the road can be contaminated by air-borne lead particles. The deposition of lead particles on the leaf surfaces is defined as lead-adsorption and the entrance of lead into tissues through is
defined lead-absorption. The amount of in washed-out
the amount of lead-absorption is measured in leaves.
The amount of lead-adsorption is less than Lead-absorption
m
old leaves is higher than in young leaves. The plants which t o the highest in leadand absorption are : and belonging
to the high class is : to the medium are : and
pus to the low class are : and and belonging to the
lowest class are : commune, vanegata and
cia
PENDAHULUAN
Sejak
warsa 1970-an
pencemaran udara
yang te jadi di
rah
di Indonesia
para
Sumber
pencemaran udara di
kendaraan bermotor.
60
-
70% dari
yang berada di Udara
perkotaan
dari
kendaraan bermotor.
kendaraan bermotor
dung
oksida
nitrogen
ozon, CO,
cenderung
yang tinggi, lincah
bahan bakar.
daya keja
yang
bahan bakar,
Motor bakar
bahan bakar
oktana yang
bahan bakar
dengan
senyawa timbal yang berupa senyawa timbal-
timbal
senyawa
dan
ke udara
terbuka. Timbal yang terdapat di udara
ke
tubuh
dan
saluran
(1973)
mengemukakan bahwa
40%
dari total tirnbal yang
diserap oleh tubuh
Staf Konservasi
