A ban has been imposed on certain Japanese imports and quality control agencies have been asked to strengthen their inspection protocols after several substandard products were found. A similar warning was issued just days ago after products of the upmarket cosmetics brand SK-II were found to contain banned chemicals, including chromium and neodymium. The General Administration of Quality Supervision, Inspection and Quarantine asked its local bureaus last night to keep a closer watch on food imported from Japan after its Zhejiang branch recently found high arsenic levels in frozen bladefish. Its Liaoning branch found a Japanese sauce also contained an unacceptably high amount of arsenic, Xinhua reported, and excessive lead in a Japanese-made soya bean salad oil. Its Shanghai branch reported finding pesticide in Japanese butterfly fish and peroxide in peanut dumplings. Xinhua said the products had passed Japanese inspections.