| Summary: | Water is a very important element in human life, used as drinking water and
daily need, household activities, and industries using land water as water source.
Land water has been polluted by lead (Pb) in parts of Yogyakarta city ranging from
0.01 to 0.04 mg/l, exceeding 0.01 limit. One location of bentonite existence is in
Bandung Village, Boyolali District. The objective of research was to find
characteristics of bentonite, change in Cation Exchange Capacity values before and
after activation and effectiveness of bentonite as absorbent to reduce lead in water.
X-Ray Diffraction was used for finding characteristics of bentonite, changes
in Cation Exchange Capacity values between bentonite which had not been activated
and bentonite which had been activated were analyzed for Cation Exchange Capacity
values. Whereas, laboratory test was conducted to find effectiveness of bentonite as
absorbent. The research was conducted in laboratory using column method, with two
stages of tests
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