Standards/33 kinds of metals mixed standard/aluminum, arsenic, gold, boron, barium, beryllium, bismuth, calcium, cadmium, cobalt, chromium, copper, iron, gallium, mercury, potassium, lithium, magnesium, manganese, molybdenum, sodium, nickel, phosphorus, lead, palladium, platinum, antimony, selenium, tin, strontium, thallium, vanadium, zinc