Acid cleaned, then double bagged

In the figure these are just a small portion of cleaned bottles and tools I will bring to Israel. For trace metal studies one of the most important parts is that you have to make sure your bottles are clean, your vials are clean and your columns are clean. Everything needs to be cleaned before you go out for sampling. That's why we need a clean room, inside a clean room we can minimize contamination from the air. The reason we need clean containers and tools is because some elements we are interested in have extremely low concentration in seawater, such as Pb, it's concentration can be only several pmol/kg in some ocean surface water. p=pico=0.000000000001=10^-12, last time I needed this unit prefix was when I measured capacitance of some small capacitors.