To express the volume of 530,000 cubic feet in scientific notation, you first identify how to write the number in the correct format.
The number 530,000 can be expressed as:
\[ 5.3 \times 10^5 \]
So, the approximate amount of fuel that the OOCL Hong Kong carries, written in scientific notation, is \(5.3 \times 10^5\) cubic feet.