Which of the following descriptions about standard addition and internal standards are NOT correct?

a) Internal standard is useful when the matrix in the unknown is complicated.
b) Standard addition could be a single standard addition or multiple standard additions to an unknown solution.
c) Standard addition is useful when the matrix in the unknown is complicated.
d) Internal standard is used when instrument response varies from run to run.

a) Internal standard is useful when the matrix in the unknown is complicated.

b) Standard addition could be a single standard addition or multiple standard additions to an unknown solution.

d) Internal standard is used when instrument response varies from run to run.

Explanation:

(a) Internal standard is useful when the matrix in the unknown is complicated.This statement is not correct as only Standard addition is used in case when the matrix of the unknown is complicated.

b) Standard addition could be a single standard addition or multiple standard additions to an unknown solution. This statement is not correct.

d) d) Internal standard is used when instrument response varies from run to run. This statement is not correct.  If the instrument response varies from run to run then. it can be mistake of various other manual and instrumental parameters. This statement is not correct

most historians agree that gabriel mouton, the vicar of st. paul’s church in lyons, france, is the “founding father” of the metric system. he proposed a decimal system of measurement in 1670. mouton based it on the length of one minute of arc of a great circle of the earth (now called a nautical mile, 1852 meters). he also proposed the swing-length of a pendulum with a frequency of one beat per second as the unit of length (about 25 cm). a pendulum beating with this length would have been fairly easy to produce, thus facilitating the widespread distribution of uniform standards. over the years, his work was revised, improved, and extended by a number of french scientists.

the political sponsor of weights and measures reform in the french revolutionary national assembly was the bishop of autun, better known as talleyrand. under his auspices, the french academy appointed several committees to carry out the work of developing a usable system of weights and measures for france. one of the committees recommended a decimalized measurement system based upon a length equal to one ten-millionth of the length of a quadrant of the earth’s meridian (i.e., one ten-millionth of the distance between the equator and the north pole).

b) nuclear ive learned that in a pedtrodic table