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Select all statements that correctly describe the difference between direct and secondary transfer of fibers.

A “curved” residual pattern most strongly suggests:

The method blank is primarily used to:

Trace metal analysis requires precisely and accurately prepared [S], [R] standards and [C] standards to ensure accurate and valid results. 

Determining very small quantities of potentially [t] elemental impurities such as lead (Pb), mercury (Hg), arsenic (As), cadmium (Cd), copper (Cu), nickel (Ni), zinc (Zn) etc. requires [h] analytical equipment. 

A higher slope m in Intensity = mC + b means better sensitivity (more signal change per concentration change).

A high R² alone proves a calibration is valid for samples prepared in a different acid matrix than the standards.

Explain why trace metal analysis is important in industries like pharmaceuticals and chemical manufacturing.

Which is the best reason to avoid boiling during nitric digestion?

Why is “matrix matching” (same acid %) between standards and unknowns important?