Pteris vittata, the Chinese brake fern, is known for its uniqueness as a voracious arsenic feeder and hence for its application in phytoremediation of arsenic contaminated soils and water. It has the ability to soak up upto 2.3% of arsenic in its fronds with very low concentrations in the roots. A greenhouse hydroponics experiment, in 20% Hoaglands solution, determined how arsenic loading such as arsenic concentrations and exposure duration affects plant arsenic uptake. The arsenic concentrations ranged from 0, 5, 10 and 15 mg/L as arsenate. They were supplied to the plants in three phases, with each being 5 days. For all treatments, the accumulative arsenic concentration multiplied by exposure time is equal to 75 mg/L-day. Results indicate that constant arsenic exposure at 5 mg/L for each of the five day exposure resulted in the highest plant arsenic accumulation.