Solubility is not to be confused with the ability to 'dissolve' a substance, because the solution might also occur because of a chemical reaction. For example, zinc 'dissolves' (with effervescence) in hydrochloric acid as a result of a chemical reaction releasing hydrogen gas in a displacement reaction.
All three kidney, liver and lungs purify the blood. The lungs help remove carbon dioxide, the kidneys remove water-soluble waste and the liver removes fat soluble wastes and many other impurities from the blood....ref:http://www.pharmainfo.net/answers/pharmaquestion/which-organ-purifies-blood.
ORGAN SYSTEM MAJOR ORGANS/PARTS FUNCTIONS 6. Cardiovascular (Circulatory) System Heart, blood, and blood vessels (arteries, veins, and capillaries) Carries nutrient-rich and oxygen-rich blood to the cells of the body; oxygen is used in the cells for burning the food and producing heat and energy Carries away wastes from cells and brings them to organs that remove them from the body Returns used blood for replenishment Carries germ-fighting blood cells 7. Digestive System