part per trillion造句

• It makes up 500 parts per trillion of the universe by weight.
• Lead exists in seawater at concentrations of 2 parts per trillion.
• These compounds are found in trace amounts, and measured in parts per trillion.
• Tin exists in seawater at concentrations of 4 parts per trillion.
• In seawater, the concentration is only 4 parts per trillion.
• By comparison, air samples not containing Asian air had just 71 parts per trillion.
• For humans, it is 1 . 8 parts per trillion.
• Praseodymium makes up 1 part per trillion of seawater.
• Geosmin has a very low detection threshold in humans of ~ 10-100 parts per trillion.
• When detected, most constituents were in the parts per billion and parts per trillion range.
• Germanium makes up 0.5 parts per trillion of seawater.
• In the other four studies the readings ranged from 13 to 881 parts per trillion.
• In principle, detection limits could be well below parts per trillion ( ng / mL ).
• For humans, it is 1.8 parts per trillion.
• A pesticide that may leave chemicals in parts per trillion should not always be thrown out.
• "Their equipment is so sensitive that it can track material in parts per trillion, " he said.
• Throughout Earth's crust, iridium's concentration is about 50 parts per trillion _ except at a certain level.
• But even in pollution cases, scientists find minute amounts-- so small they're measured in parts per trillion.
• MATMOS will be able to measure trace gases in Mars's atmosphere at a concentrations of parts per trillion.
• The soils contain approximately 0.25 parts per million of bismuth, and seawater contains 400 parts per trillion of bismuth.