SALEM — Oregon on Friday became the 12th state to ban the disposal of certain electronics into landfills.

The second phase of the state’s electronics recycling law makes it illegal to trash televisions, computers and monitors and could lead to a $500 fine for people who do.

Oregon’s e-cycles law was passed in 2007 to slow electronics waste and the toxins released as they break down. The first phase was launched a year ago and required electronics manufacturers to pay for a permanent statewide program with free, convenient recycling.

In the first eight months, Oregon collected more than 14.3 million pounds of TVs, computers and monitors, a 32 percent increase in electronics recycled over 2008.

Diverting more electronics waste curtails one of the fastest-growing segments of Oregon’s waste streams, said Kathy Kiwala, who oversees the program for the Department of Environmental Quality.

The move also reduces a major source of toxic chemicals in landfills. Electronics account for 40 percent of lead and 70 percent of other toxins, including mercury and cadmium, in landfills, according to the Environmental Protection Agency.

Recycling also saves natural resources and the energy it takes to mine them, Kiwala said.