A lesson in how to analyze gas chromatography (GC) lab results including peaks and percent composition of mixtures. Get the guide and sample lab report here: www.chemcomplete.com/product-...
Пікірлер: 113
@skitlles19233 жыл бұрын
This was so helpful! In the age of online learning this was the best thing that I came across all semester!
@jemimamoses72123 жыл бұрын
Thank you for this simple and clear explanation! This will help me a lot.
@hazeld80162 жыл бұрын
Thank you so much! In just over 10 minutes, you taught me what a GCM was and how it worked as well as exactly what I needed to know to analyze the results which neither my teacher nor my textbook nor my TAs could do for me so thank you again
@sankarasubramanian50533 жыл бұрын
Thanks a lot. Simple and clear explanation.
@naadiahmazlani Жыл бұрын
Thank you for making this video. it was clearly explained.
@cheyma79453 жыл бұрын
You're a life saver!!
@dhifarhasan69483 жыл бұрын
thanks a lot, that's helped me so much
@mrphysh5 ай бұрын
I am sure that you were a very good student. I bet you got an A in every class you ever took! Good job
@Laura-hj2kk3 жыл бұрын
really informative, helped me understand a lot more! thanks!
@ChemComplete3 жыл бұрын
Glad to hear it!
@crazygokerff25172 жыл бұрын
@@ChemComplete Hi the percentage you calculated is the sum of peak Hight to assume the concentrations of product
@anitaten38563 жыл бұрын
thank you for such a helpful video!!!
@sabertooth_almas3 жыл бұрын
Very helpful, thanks!
@olaleyeolutunde4 жыл бұрын
Nice and well explained
@JonWu07167 ай бұрын
So helpful, thank you so much!
@crosshiiro79702 жыл бұрын
great video! Very informative, thank you very much
@ChemComplete2 жыл бұрын
Glad it was helpful!
@SpencerFH3 ай бұрын
when you describe the matching of peaks to boiling points, you put a dash in between y and z and their boiling points but not x. this makes it look like they are negative (-82 and -37) while x is positive.
@Priyanka-tt8cg3 жыл бұрын
precise and informative
@thesealab89473 жыл бұрын
Excellent! cheers mate!
@HadyAkAHady28 күн бұрын
amazing job thanks
@CienciaPelada3 жыл бұрын
Thank you!!
@camid74033 жыл бұрын
this helped so much!!
@oandalevelchemistry80952 жыл бұрын
Good video. A point to be noted: different compounds yield different peak area even if they have the same concentration; e.g. 100ppm of X, 100ppm of Y, 100ppm of Z will not yield the same peak area. Taking only the areas to calculate selectivity/composition could yield wrong results. The compounds need to be calibrated and their respective concentrations should be used to calculate composition and selectivity.
@Alfalfaello3 ай бұрын
I was actually looking for this comment. Thank you! It was essential to clarify it
@brittnhuli2 жыл бұрын
great explanation! a little feedback... for the visual learners it would help to add a diagram of the standard gas chromatography setup, while youre explaining how the gas is passed through the coils. and put it next to the graph while youre explaining that the nonpolar parts are expelled first.
@ChemComplete2 жыл бұрын
Thank you for the constructive feedback. I will consider in in future work.
@maximehendrickx62122 жыл бұрын
Great video!
@saka_inrmy62933 жыл бұрын
Thank u so much for this
@gollaprathima11343 жыл бұрын
Thank you so much
@Beautifullife71893 ай бұрын
Thank you so much it is very informative videos
@Aleu9314 ай бұрын
Thank you
@kubra7996 Жыл бұрын
thank youuuuu for this video
@ireneaa58903 жыл бұрын
thank you for this video! very excellent. Can you make a video of how to analyze essential oil using GCMs
@clementinenamazzi78523 жыл бұрын
Thank you very much it is informative, there are samples with over 60 compounds do i do the same to get the percentage of each?
@manashjyotibaruah67583 жыл бұрын
This is helpful.
@georgesunnyvarkey34253 жыл бұрын
Thankyu so much sir
@iraqi36122 жыл бұрын
thank you so so much sir
@ChemComplete2 жыл бұрын
Most welcome
@praveenmishra78633 жыл бұрын
nice explanation.....
@franknjmt13 жыл бұрын
Awesome!
@mome1233 жыл бұрын
Really good video man! I was just wondering is it possible to use this method with a unkown sample withouth having ms or lc. And do you need to have the boiling point for all the molecules in you sample you testing before using this method ?
@georgesunnyvarkey3425 Жыл бұрын
Thanks bro ❤️
@galaxy62512 ай бұрын
bro stretches this out wayyyyy longer than it needed to be
@snowflakes111114 ай бұрын
Best video
@budia307011 ай бұрын
Thanks You very much, It is very good lesson for the GC understanding, but I still not clear for the area to be Calculated
@stephennguyen94762 жыл бұрын
Can we able to calculate of RF value when we have GC report which allow us to know retention time and area which is in μV-s? Thank you very much.
@judeonwudili96192 жыл бұрын
To use this 'simplistic' method, you must make it clear that you have assumed or confirmed that the 3 components have similar (even the same) response factors in the particular detector being used.
@ChemComplete2 жыл бұрын
This is true and does need to be accounted for in more complex lab work and mixtures. This video is aimed at students first experiencing GC labs in general or organic chemistry. It would not be appropriate to teach response factors until an upper level course such as instrumental chemistry or an advanced spectroscopy course.
@rachelhughes28372 жыл бұрын
Shouldn't the x and y be swapped over? The peak is high so I'd of thought x would be in the second highest peak? I thought it goes in order of boiling points to high and low peaks. If that makes sense
@gbbanaag39543 жыл бұрын
Thanks really helpful, but if we have 2 compounds that have similar boiling point 1 cis and 1 trans which one has the lower retention time? Appreciate your feedback. Thanks
@ChemComplete3 жыл бұрын
In GC compounds are separated by relative boiling points. Look for the lowest boiling point and it should be your first peak.
@user-md5ki5su6c6 ай бұрын
How did you get the precise areas? Is there a table in MestreNova that shows the peak width and exact intensity that can then be used to calculate the area? Thanks
@NamesIWantAreInvalid3 жыл бұрын
how would we adjust the ratio for the bias of a detector?
@anamikaG282 жыл бұрын
May I know how to calculate the area of the peak, as in real graph, the peaks are not very sharp as triangle where we could apply triangle area formula. Kindly let me know from where will I get the area of the peaks.
@terenica2 жыл бұрын
how does this change if it is a relative retention time?
@jaykumarbhatt88412 жыл бұрын
Thnks sir 🙏 Very good sir👍 Sir what is the effect of column I.D and film thickness ????
@clip0123 жыл бұрын
How about Normalized Peak Area? Normalized against biggest peak and get corrected area?
@Poolshockguy3 жыл бұрын
GC shows 54 in area but under amount where it shows PPB it says -12,000. What does this mean
@epalanisamiepalanisami68632 жыл бұрын
Can we use Methanol solvent for edbileoil fame preparation?
@Beautifullife71893 ай бұрын
Sir how to calculate the area of any retention time
@kienphamtrung51732 жыл бұрын
how did you do it can you share with me , thank you
@NamrataGawai283 жыл бұрын
If mixture of methanol, acetone and MDC mixture which peak elute first . Elaborate your answer.
@kiranshahzadi2465 Жыл бұрын
how do you calculate values like 22.375
@sophies81073 жыл бұрын
isn't y=-82C the lowest boiling point? idk if thats a typo because you just say y=82 when u talk but wrote something else.
@Miyakimiki2 жыл бұрын
He wrote the "-" as a reference to connected it to y. It's confusing because he didn't do it for "x". But it's meant just to show y - 82 to show that y is 82 (it is not -82).
@KacyKhietNguyen4 ай бұрын
what if there is 3 possible products but the GC data only show 2 peaks what does that mean, how do I know which one is which one and what is present of not
@marcochimio2 жыл бұрын
I am presuming that the Percent composition is by mass, and not by volume or mole fraction. Is this correct?
@tulip8112 жыл бұрын
Hey can someone help. How can I get the quantity (in grams) from the area in % ?
@humakhan76942 жыл бұрын
How to calculate area then?
@carmelaeugenio17464 жыл бұрын
where did you get the area of retention? what is the formula?
@ChemComplete4 жыл бұрын
Area is provided by the GC instrument. This is a random example teaching you how to utilize your data.
@AliAsghar-ue4lm2 жыл бұрын
Percentage composition is by mole % or mass %
@cdietrich3252Ай бұрын
(SUMMARY of text below): GC gives mole %. readings (percentage composition = mole %) (MORE DETAILS) I'm wondering this as well! I am 99% sure that percent composition for GC is by mole %. My thinking is that percent composition assumes "amount," and "amount" is always by moles. He also states in the video that "the GC does not know what chemicals you have," so mole% makes the most sense as the GC does not know anything about the masses of each component, which it would require in order to find mass%.
@andrewjustin256 Жыл бұрын
What do those invariable peaks mean, some are long and some are short?
@shyamlokhande3466 Жыл бұрын
How can we calculate the %yield of our product in reaction mixture using GC-MS, With or without taking any internal or external standard. Can anyone help??
@jackdawson7385Ай бұрын
How do we get the value of area of retention time 3.1 minutes i.e. 22375
@aven29132 жыл бұрын
Is that template ACS format?
@ezekasarachifelix44713 жыл бұрын
Hi, can you make a video on waste engine oil analysis by GC?????
@madhurpandey5000 Жыл бұрын
Please find out the area of pics
@indrajeetw.53652 жыл бұрын
Thank you.. Please make a video on, how to calculate selectivity and conversion by using GC...
@sunithas57822 жыл бұрын
What would happen if retention times of compounds if the column temperature were raised?
@MrsLacqueredClaws2 жыл бұрын
Hi, not the OP here, but doing GC lab work is my job, and generally speaking, if you expect a certain Rtime and your results show an Rtime higher than control (or reference), then you are looking at a similar, but ultimately different compound. RE: THC vs synthetic cannabinol
@tubetigeerr3 жыл бұрын
does the machine automatically calculate the area? thanks
@ChemComplete3 жыл бұрын
Often times it may, especially with more modern instruments, but not a guarantee.
@xharuu2 жыл бұрын
how’d i get from my 8th grade chem class to this
@NanaAdjeiwaa-ei6om8 ай бұрын
Please can oxygen be used instead of zero air?
@bariumselenided51522 ай бұрын
Dude, I _knew_ this instrument had to be set up to give you the integral. Idk why but our professor has us doing this some weird way where we estimate the integral by printing it out and physically measuring height and width to get a rectangular approximation. Why? Why couldn't I just be given data if the instruments give you data? And if we're going old school, why not cut out the peaks and weigh them? At least that method is cool.
@user-wp5tp2ut5n3 жыл бұрын
but the area gives the mass or the mole percentage?
@AliAsghar-ue4lm2 жыл бұрын
Have you got this answer ? Plz share
@erzas556 Жыл бұрын
but how to calculate the concentration using the area and height?
@ranarajeshwari9953 Жыл бұрын
Did u find it?? If u know..plz ask me..I have same problem
@jaxanax71623 жыл бұрын
Is the "Retention time" and "m/z" the same thing?
@mariamoubarak3 жыл бұрын
No. "retention time" peaks is what you get from the GC. m/z is what you get from the mass spectrometry after the GC. It relates to the fractionation of the compounds into their fraction ions which is related to the mass to charge ratio of each ion that fractions from a given compound
@ClutchDaddy912 жыл бұрын
I know they say there are no dumb questions, but.. How is the area calculated for the compounds?
@caseypickens85928 ай бұрын
You first draw a baseline (you would not use the x-axis line).Then you would measure from the top of the peak to the baseline to get the height and then to get the width, you would go to the halfway point on the height and then measure the width from there. So, the equation would be A= H x W(1/2) if that makes sense.
@mona199696 Жыл бұрын
Gerate Video , but i`m a bit confused do you mean y= 82 °c Or Why is it last to avaporate ?
@mona199696 Жыл бұрын
Instate of minus 82*
@nhatle61293 жыл бұрын
how does z have lowest boiling point
@marianafaria42333 жыл бұрын
I think he meant 82°C instead of -82°C
@inemesitakpan2262 жыл бұрын
what's the unit of the area
@ChemComplete2 жыл бұрын
This can depend on the GC being used, but generally it is the area of the x and y axis units. So most GC will have minutes (retention time) along x and a volts (detector signal) on the y axis. So a common unit might be volts-minute.
@rachelhughes28372 жыл бұрын
how did u calculate the 22,375 ?
@akhileshchaurasiya94084 ай бұрын
Area of triangle formula put down in the peak portion
@Fummy0072 жыл бұрын
4:09 I thought it was minus 82 and got confused
@vithenych96053 жыл бұрын
This does not seem right to me. Your calculation assumes the same detector response to all compounds. However this is not true. 50/50 % mixture does not generally make 50/50 % response. I would say you need to know the response factors to make the calculation.
@AristotleFreeman4 ай бұрын
the only one still sup this are the bot answers its hilarious.
@rassimsimou15948 ай бұрын
G😊😊d
@jibrilmunira86 Жыл бұрын
paying for this lab report was a waste of money. Nothing new in it.
@rubaetm53533 жыл бұрын
Dragon ball z is the best
@humakhan76942 жыл бұрын
That cracks me up... reading all the comments knowing might I will find my answer related to GC.. lol