BRITISH COLUMBIA: A study has revealed high levels of the chemical permanently in the body of an endangered killer whale, according to researchers in the British Columbia province of Canada, 4-nonylphenol was found in the whales studied. (4 np) found chemicals. np Chemicals are often used to make pulp and paper, but they are also used in soaps, laundry detergents, and textiles. This chemical is used to treat water. It can enter the ocean in the form of wastewater from plants or industrial waste. Because killer whales are at the top of the food chain, they eat small organisms contaminated with this chemical.