1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
NNADVOKAT [17]
3 years ago
7

A researcher was attempting to quantify the amount of ddt (dichlorodiphenyltrichloroethane) in spinach using gas chromatography

mass spectrometry (gcms). first attempts using external calibration proved difficult, as reproducibility and external standard agreement were poor. to overcome these problems, the researcher used the internal standard calibration method with chloroform as the internal standard. to begin, the researcher analyzed a sample containing 6.44 mg/l ddt standard and 1.41 mg/l chloroform as the internal standard, which produced peak areas of 3979 and 9257 for the ddt and chloroform, respectively.
a. determine the response factor (f).
Biology
1 answer:
Butoxors [25]3 years ago
4 0

Answer

Given data

                   Conc. of standard ddt = 6.44mg/l

                   Conc. of Internal standard chloroform = 1.41mg/l

                   Peak of standard ddt = 3979

                   Peak of internal standard chloroform = 9257

Required

              Response factor (RF) = ?

Solution

               As we know that  

               Response factor (RF) = Peak area/sample amount

So RF for standard ddt

                                  RF = 3979/6.44 = 617.85  (answer)

RF for internal standard chloroform

                                RF = 9257/ 1.41= 6565.24 (answer)


You might be interested in
Scientists studied reproduction in the New Zealand mud snail to answer the question, “Are there benefits to reproducing sexually
Kryger [21]
Snails are asexual they create their own baby's with themselves. they have both parts....thats all ik
7 0
3 years ago
Read 2 more answers
Science: An animal without a backbone is called A.) A vertebrate B.) An invertebrate C.) A chordate D.) An endotherm
andreev551 [17]

The answer would be B) Sponges, corals, worms, insects, spiders and crabs are all sub-groups of the invertebrate.


6 0
3 years ago
1. ___observation is made using one or more of the five senses.
Varvara68 [4.7K]
The observers is based only on an experiment
3 0
3 years ago
When a person is experiencing heartburn he or she feels a burning sensation in the throat and mid chest. What most likely causes
Gala2k [10]
The most likely cause of the burning sensation is acid reflux which travels back up the esophagus and irritates the esophageal lining. The chest pain felt can feel almost like a heart attack but it is best described as referred pain from the esophagus.
Should this heartburn persist, it is highly recommended to see a physician because the acid can erode the esophagus lining & the abdominal lining leading to ulcers. Easily treatable condition.

From a personal level this is awful!
3 0
3 years ago
Colorblindness is a sex-linked recessive trait. If B=normal and b=colorblind, what would be the genotype of a normal male? Quest
Flauer [41]

Answer:

The Genotype of a normal male wil be: XBY.

Explanation:

  • A sex linked recessive disorder is expressed only in males because males have only one X chromosome and so only one allele for this gene can be present in them.
  • Hence, if the recessive allele is present then colour blindness will occur.
  • If the dominant allele is present then the male will be normal.
  • XbY has a recessive allele so the male with this genotype will be color blind.
  • XBYb cannot be aoption because Y chromosome cannot have the allele of the gene.
  • XBXb is a female carrier's genotype.
  • XBY has the dominant allele and so the man with this genotype will be normal.

3 0
3 years ago
Other questions:
  • Each nucleotide of rna contains what type of sugar
    9·2 answers
  • 10. A protein enters a cell. The outside of the cell has a higher concentration of that protein than the inside of the cell. Did
    9·1 answer
  • Which of the following best describes a benefit of one type of nonrenewable energy? (2 points)
    10·1 answer
  • One codon specifies how many amino acids?
    9·1 answer
  • A condition in which the blood is deficient in red blood cells, hemoglobin, or both is:
    5·1 answer
  • Suppose you have monohybrid snapdragons in your garden and you find that they produce red seeds to white seeds in the ratio of 3
    5·2 answers
  • How do the unique properties of water make it so important for life on earth
    10·2 answers
  • Which is true regarding the TCA cycle (Krebs cycle)? A. pyruvate is an end product of the cycle B. energy capture in the cycle i
    15·1 answer
  • How do we get the glucose we need to power our cells? a. Breathing b. Exercising c. Eating d. Drinking water
    5·1 answer
  • 2 Lin sulks during the first week of rehearsals because she is – A tired from working on the set B bored with her duties as a de
    11·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!