The composition of natural seawater is intricate in the balance between macro elements and the minute trace elements and nutrients that provide the perfect chemistry responsible for the vibrant and beautiful marine life that we admire so much. But it's not just about what is present in seawater. It's equally important to know what shouldn't be in your water. Accurately understanding the makeup of your water from the must abundant down to the most minute elements is what enables the best results. Our ICP-OES test kit measures Al, As, B, Ba, Be, Bi, Br, Ca, Cd, Cl, Co, Cr, Cs, Cu, Fe, Ga, I, In, K, Li, Mg, Mn, Mo, Na, Ni, P, Pb, Rb, S, Se, Si, Sr, Tl, U, V, and Zn.