Iran 's crude oil exports rebounded by about 10% in September on higher Chinese sales, a shipping tracker said recently. That would suggest the impact of sanctions on the country's largest source of revenue may be stabilizing after a steep drop in the country's currency.

Sales stood at 1 million barrels a day last month after falling to about 900,000 barrels a day in August after the European Union started its oil embargo against Iran , the shipping tracker said. The EU buys about 20% of Iran 's oil exports.

The rial has shed about 25% of its value against the dollar this month amid mounting sanctions aimed at halting Iran's nuclear program, which the U.S. and the EU say is geared to building nuclear weapons. Tehran says it is developing nuclear energy to generate power.

But oil exports are still only about half the volume earlier this year. In addition, Iran is having a tough time getting paid by its Asian customers due to sanctions on its banks.

Recent restrictions approved in the U.S. against the National Iranian Oil Co., along with pressure on the country's tanker fleet, could also complicate sales and payments in the future.

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