A solution that is 1 ppm contains more dissolved solute than one that is 1 ppt.

Let's clarify the meanings of ppm (parts per million) and ppt (parts per thousand) to understand the comparison correctly.

1. Understanding ppm and ppt:

   • PPM (parts per million) indicates a concentration of 1 part solute per 1,000,000 parts of solution.
   • PPT (parts per thousand) indicates a concentration of 1 part solute per 1,000 parts of solution.

2. Comparison:

   • To compare the two, we can express them in similar units.
   • 1 ppm = $\frac{1 \text{ part}}{1,000,000 \text{ parts}}$
   • 1 ppt = $\frac{1 \text{ part}}{1,000 \text{ parts}}$

3. Calculation:

   • If we convert both to the same basis, we find:
     • 1 ppm is equivalent to $\frac{1}{1,000,000} = 0.000001$
     • 1 ppt is equivalent to $\frac{1}{1,000} = 0.001$

4. Conclusion:

   • Therefore, 1 ppm corresponds to a lower concentration than 1 ppt. In fact, 1 ppt equals 1000 ppm, which means a solution that is 1 ppt indeed contains significantly more dissolved solute than one that is 1 ppm.

In summary, this statement is incorrect. A solution that is 1 ppt contains far more dissolved solute than one that is 1 ppm.