I am so surprised that our YEC brothers are not beating the doors down to defend their leadership from the list of deliberate misrepresentations and lies I have been asserting that they make to support their view. Well on with the show, I suppose.
One of the common arguments you run across is that the earth cannot be old based on the rate at which various salts run into the ocean. This line originated with Henry Morris (Morris, Henry M., 1974.
Scientific Creationism, Green Forest, AR: Master Books, pp. 153-155.) and is still used by young earthers today. For an example see ICR.
http://www.icr.org/pubs/imp/imp-017.htm
The origin is work published in 1965 (Riley, J. P. and G. Skirrow, (editors). 1965. Chemical Oceanography (Volume I) Academic Press, New York.) where the residence times of various metals in the ocean were listed. Now the first mistake is that these are residence times which is how long, on average, the metal stays in the ocean before being removed. But Morris calls it the time "to accumulate in ocean from river inflow." This is a major difference and error.*
Now the range of residence times is from 100 years for aluminum to 260 million years for sodium. Usually YECers will just quote the few in the middle that come out to be in the 6 - 10 thousand range. (Props to ICR here for at least including all the values even if they did not tell the truth about what is meant by the data.)
The other thing that they fail to tell you is that these elements are known to be at or very close to equlibrium, that is that the rate in is equal to the rate out. There is no net accumulation. This means that even if the residence time of nickel is 9000 years that this cannot be used to determine an age because you have no way of knowing how long it has been at equilibrium.
SO now we have exposed two flaws in how ICR presents the data. Flaws that they should have been aware of. So either they are talking about things they do not understand and pretending that they do. Or they are purposefully leaving things out in order to misrepresent the data.
But, they have been called on this enough times that some YEC organizations ae trying to address the problems. See the following for example.
http://www.answersingenesis.org/docs/3910.asp
In this, Sarfati tries to demonstrate that only 27% of the sodium that comes into the oceans each year is removed. He believes that he is showing that the ocean is not at equilibrium with respect to sodium. But he makes two major mistakes. The first is very serious. They miss the amount of sodium removed by the alteration of basalt by hydrothermal activity by a factor of 35. If you go back to the original by Austin and Humphreys, you will find that one of their references is a book (Holland, H. D., 1978. The Chemistry of the Atmophere and the Oceans, New York: John Wiley and Sons.) that gives the correct value. So why did they put in such a bad value? The other bad claim is that there is not any removal of sodium by biological activity. Another reference of theirs (Holland, H.D., 1984. The Chemical Evolution of the Atmosphere and the Oceans, Princeton: Princeton University Press.) tells of biological removal, so there is no excuse for this either. It is a misrepresentation, but it is of much less consequence because of the smaller amounts involved.
Once the corrections are made, instead of only 27% being removed, you come up with 7% too much being removed. This is well with the range of experimental error and is consistent with the oceans being in equilibrium with reference to sodium.
And you see these kinds of mistakes made often. Bob will often get stirred up and post for pages on uranium instead of sodium. What he always fails to tell you is that the difference in measured removal rates from the input rates is less than the experimental error in measuring the rates. This means that equilibrium is within the experimental error. So from the data we have, you cannot say that uranium is not at equilibrium.
------------------------
*Let's explain the difference. Say that you have a 100 gallon tank and it has a valve at the bottom that will allow exactly 10 gallons per minute to run out by the force of the head of water when the tank is completely full. Now the residence time would be (100/10=) 10 minutes. The time to accumulate 100 gallons from an empty tank, however, would be much more than 10 minutes because as soon as you started adding water, some would begin to leave through the valve. Less water would leave than was entering until the tank was full and the situation reached equilibrium. That is also the case here. The residence times are listed but the time to accumulate would be much greater. And since they are at equilibrium, you cannot tell how long they have been at equilibrium so you cannot use them to date.