“…Many samples were also analyzed for gold, arsenic, copper, lead, zinc, silver, bismuth, cadmium, and antimony using atomic-absorption (AA) methods described by Ward and others (1969), Thompson and others (1968), and Viets (1978) and for tungsten by colorimetric (CM) methods (Welsch, 1983). The precision of theSES method is given by Motooka and Grimes (1976).…”