Take note . . . three people have been arrested in Beijing for trying to use eight foreign banknotes printed with the Chinese characters for ''Hong Kong Standard Chartered Bank''. Police are probing the discovery of similar notes in Hong Kong. The China News Service said police arrested two men and a woman trying to use overprinted Peruvian and Uruguayan currency to buy two blue diamond rings worth 15,000 yuan (about HK$20,100). In Hong Kong, Detective Senior Inspector David Wan Tat-wai of the Commercial Crime Bureau said eight Peruvian, Uruguayan and Mozambique banknotes overprinted with the same characters had turned up since last month. ''We have been told by the Peruvian consulate the currency in question had been out of circulation since 1991,'' he said. ''We believe the criminals used a primitive method of printing the Chinese characters of the bank's name and the denomination on a foreign note to fool farmers in China - most of them can't read English.'' Police believe the notes are being brought here by mainlanders who try to exchange them at the Standard Chartered Bank.