The phrase "also needed to determine" is correct and usable in written English.
It can be used when discussing additional requirements or factors that must be assessed or evaluated in a particular context.
Example: "In order to complete the project successfully, we also needed to determine the budget constraints."
Alternatives: "also required to assess" or "additionally necessary to evaluate".
Studies are also needed to determine how powder characteristics like particle size and chemical composition relate to the risk of becoming ill.
Further research is also needed to determine if enhanced glutathione production is also observed in tumors that harbor mutations other than those in the PI3K/AKT pathway.
Because of this, an examination of utility is also needed to determine which method will define hotspots that will be most useful for conservation purposes.
Further research is also needed to determine whether or not double gloves and/or the use of antiseptic scrubbing in addition to painting are efficacious.
Deriabin wanted to test Nosenko's willingness to cough up crucial facts about KGB operations, but he also needed to determine whether he was actually a former Russian operative in the first place.
However, a greater wealth of production documents and secondary sources related to the films she worked on is also needed to determine more about the nature of her collaboration and influence.
Leadership is also needed to determine and share best practices that may improve capacity without increased funding.
Additional research is also needed to determine how the C version of the gene affects the protein's function.
More studies are also needed to determine whether long-term exposure to ozone, over weeks to years, is also lethal.
Research is also needed to determine any possible adverse effects from the transport of alum-stabilized myo-IHP to water bodies, for example by erosion.
More work is also needed to determine how many examples are sufficient for generalization to occur (and this, of course, will vary with contextual factors and individual differences).
