Which statement is true for flame ionization detectors (FID)? A)FID employs a beta emitter to ionize...

Which statement is true for flame ionization detectors (FID)?

A)FID employs a beta emitter to ionize the sample.

B)Emission spectra are used to quantify the peak concentration.

C)The FID flame gets cooler in the presence of hydrocarbons eluent.

D)FID relies on the combustion of the sample carbon atoms which produce CH radicals, CHO+ions, and electrons which are then detected.

E)The detector responds by combusting hydrogen gas from the mobile phase.

The term “column bleeding” refers to:_______________.

A)leak of carrier gas from the column.

B)poor resolution of low volatility compounds.

C)stationary phase decomposition.

D)decomposition of analytes on the column.

E)stationary phase contamination.

Expert Solution

1. E.) is correct because the detector responds by combusting hydrogen gas from mobile phase,

firstly eluent travels up thedetector, it is mixed with the hydrogen gas and then with the oxidising agent. The mixture of these three continues to travel up to the head of nozzle where a positive voltage exists. This positive voltage is repelled up toward the plates known as collector plates which are connected to an ammeter which is very sensitive, which detects the ions hitting the plates, then it amplifies the signal. The products of the flame finally get out of the detector through the output port. So hydrogen helps in detection.

queen_honey_blossom answered 2 years ago

Write 2-4 sentences explanation summary for the detectors of each GC; FID Flame Ionization Detectore ,...

Write 2-4 sentences explanation summary for the detectors of each GC; FID Flame Ionization Detectore , ECD Electron capture Detector ,and TCD thermal Conductivity Detector. Also each of HPLC: UV-VIsible Ditecor, Fluorescence detector, and Evaporative Light Scattering detector.

Which of the following is a true statement? Which of the following is a true statement?...

Which of the following is a true statement? Which of the following is a true statement? a. The electric potential energy depends on both the electric field and the amount of charge moving through that field. b. The electric potential depends on both the electric field and the amount of charge moving through that field. c. The electric potential energy and the electric potential depend on both the electric field and the amount of charge moving through that field. d....

Which statement is true? Which statement is true? An orbital that does not penetrate into the...

Which statement is true? Which statement is true? An orbital that does not penetrate into the region occupied by core electrons is less shielded from nuclear charge than an orbital that penetrates and will therefore have a higher energy. An orbital that does not penetrate into the region occupied by core electrons is more shielded from nuclear charge than an orbital that penetrates and will therefore have a higher energy. An orbital that does not penetrate into the region occupied...

1. Which of the following statements about beta diversity is TRUE? A. Beta diversity does not...

1. Which of the following statements about beta diversity is TRUE? A. Beta diversity does not change when you measure it at different scales B. All else being equal, generalists are more likely to be common when beta diversity is high C. Homogenous landscapes tend to have high beta diversity D. Topographically diverse, heterogenous landscapes tend to have high beta diversity 2. Which of the following statements about species-accumulation curves is TRUE? A. Only gamma diversity can be estimated using...

which are true: A) The 2nd ionization energy for k would be represented using the equation...

which are true: A) The 2nd ionization energy for k would be represented using the equation K+(g) --> K2+(g)+e- B) the first ionization energy of Br should be smaller than the first ionization energy of Br2- C) the successive ionization (in a hypothetical unit) for an unknown element are IE1=200, IE2=300, IE3=425, IE4=2500. The possible identity of the element is Be.

Which of the following statements regarding beta particles are true Check all that apply. Beta particles...

Which of the following statements regarding beta particles are true Check all that apply. Beta particles have a mass number of 0. Beta particle formation is accompanied by the conversion of a proton into a neutron. Beta particle formation is accompanied by the conversion of a neutron into a proton. Beta particles have a nuclear charge of +1.

Which statement regarding macroeconomics and microeconomics is TRUE?

Which statement regarding macroeconomics and microeconomics is TRUE? Neither macroeconomics nor microeconomics is concerned with prices. Because it focuses on national economies, macroeconomics does not study international trade and finance. O Microeconomics examines consumer behavior, while macroeconomics studies business behavior. Macroeconomics employs many of the same analytical tools as microeconomics. Prices typically contain more useful information for buyers than for sellers. False True A market is a physical location that enables buyers and sellers to interact and transact with one another. True ...

Part B Which of the following is not a true statement? Which of the following is...

Part B Which of the following is not a true statement? Which of the following is not a true statement? Under SN2 and E2 conditions, primary alkyl halides form primarily substitution products. Primary alkyl halides do not undergo SN1 and E1 reactions. Under SN2 and E2 conditions, secondary alkyl halides form both substitution and elimination products. Under SN2 and E2 conditions, tertiary alkyl halides form both substitution and elimination products. Under SN1 and E1 conditions, tertiary alkyl halides form both...

Which of the following statements are true? There may be more than one true statement. A....

Which of the following statements are true? There may be more than one true statement. A. Any linear combination of vectors can always be written in the form Ax for a suitable matrix A and vector x. B. Every matrix equation Ax=b corresponds to a vector equation with the same solution set. C. If the echelon form of the augmented matrix [A | b][A | b] has a leading entry in every row, then the equation Ax=b is inconsistent. D....

Which of the following is a true statement about virtual images?

Part A Which of the following is a true statement about virtual images?You cannot see a virtual image. A virtual image must be larger than the object A virtual image is formed at the position from which the rays appear to have originated A virtual image must be upside down Part B If an object is placed a great distance away from and in front of a converging lens such as the one shown in the video, where will its image be formed? It will be a...

Question