The Spectrophotometer: A demo and practice experiment
ฝัง
- เผยแพร่เมื่อ 6 พ.ย. 2011
- The spectrophotometer is an instrument used to measure the effect of a sample on a beam of light. We can learn a lot about a substance by studying the way it interacts with light.
In this video, we'll demonstrate how to use a spectrophotometer to perform a basic experiment: determining the absorbance spectrum of red food coloring.
Included in the video is a short animation that illustrates the inner workings of a spectrophotometer.
Special thanks to Joe Issa and the Gaston College Biotechnology department for helping to make this video.
Practice using a virtual spec www.ncbionetwork.org/educatio...
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very relaxing review before a lab practical
Exactly
Exactly
Exactly
Exactly
Precisely
bsmls 1b was here
wala tayong ganto sa school scamm
Thank you so much for such an effective demo, I got the idea of how to use this machine
best explanation out there on how to use it. Thank you!
Thankyou so much, today is my practical examination, and it was really really useful one😍
Excellent video. Clear cut and well filmed.
no cap. this channel goated
One of the best review of Spectrophotometer in lab
very nicely explained and the content is so smooth and crisp :)
have a bio lab practical tomorrow, easily learned how to use it more by watching this video. thanks!!!! :)
Relaxing demonstration with fine video shot
could have never found a better explanation than this yohhhh!
That's awesome! It would help me a lot for my experiment next week :D
Awesome job explaining this, thanks.
Thank you for upload. The explanation how it works is very good!
This video was very helpful to me. Thank you so much for the video
This would come in handy for my lab tomorrow
Now I have a way to measure if an increase/decrease of algae occurred in a sample of gymnodinium!
Imagine working in a lab full of these retro style equipments 😌
THANK YOU SO MUCH
nice video helped me to learn more
Awesome and very useful😊😊
How do you determine the wavelength that should be used? can it be a constant, and keep it the same for all my samples?
I'm assuming they are using a hydrogen source light where it has a constant wavelength when it enters the spectrometer. Then use this equation: d sin(theta) = m (lambda), where d = grating distance (which is written on device), m = 2 (using Balmer series for visible wavelengths). Then you get four discrete wavelengths of: 410 nm, 434 nm, 485 nm, 656 nm which are the spectrum of hydrogen emission.
That intro music was fire 🔥
that was beautiful :')
nice explanation...thanks bio network..
6:07
What does this plot mean? What's our interpretation?
As you can see, the absorbance is relatively high for wavelengths below 600, but 600 above is not absorbed and hence, transmitted.
So the photons reaching your eyes from going through this solution, mostly have wavelengths between 600 and above and hence, the red color.
I hope this helped a bit.
It helped a lot! Thank you
Thank u soo much
Thank you for your remarkable conclusion. it meant a lot to me.
Thank you very much.
Why does transmittance of a blank have to be adjusted to 100% before recording the transmittance (or absorbance) of sample at any wavelength?
tkanks for demo and practice exp
Thank you 🎈
Thank you so much
can you find starch concentration using uv spectrophotometer?
Idk why I find this video so peaceful ahaha
Hye.. I have a question. If this is for adrenaline test in saliva, how could it help..? the output are all numbers on transmissions and absorbency. the aim to test the adrenaline is to detect stress, and through this test, how could it help? Thank u in advance.
How can we calibrate spectrophotometer for lower concentrations of iron? Like in 1-5 PPb.
I have a practical too on monday!!!
Very helpful....thanks
At 2:07 what adjustment does the spectrophotometer makes inside when Transmittance is set to 100% while blanking ? what is behind that 100% transmittance knob?
Same question I need an explanation please
You just saved me from failing a bio lab practical! Thank you so much!! :D
@@sasmitvaidya3594 its 8 bro
@@telracsazyl1243 was 6 at the time he commented
someone know why they didn't make transmittance vs wavelengh tab?
what is the purpose of using blank solution?
Hey are we increasing the wave length?
Thanks a lot
Excellent
Can this be used for analysis of phosphorus content in plants
Hi, this is a very interesting video and easy to understand. I'm currently a second year pharmacy student, and I am learning about Spectrophotometer. Can I use this video for my college project? I'll give BioNetwork some credit or acknowledgement in my video. Thank you so much, stay safe and healthy!
Yes, you are welcome to use the video as part of your project. Please provide the appropriate reference / citation to this video. Thank you!
It helps alot 👍
I am not totally sure of your question here. The sample concentration is irrelevant for this activity. If you plot wavelength on x axis (380, 405, 430 nm....... ) versus the measured absorbance on the y axis you will find the wavelength of maximum absorbance, called lambda max. Each color has its own lambda max. That is the goal for this particular lab.
why it's adjusted to 100% T every time wavelength is changed?
so good
Me too!! Ahhhh :S good luck!!
What is the blank solution used here?
how to calibrate the spectrophotometer?
Can you tell me, what is the concentration of your samples, which you inserted into the sample compartment? I'm confused, varying wavelengths when you use?
I was thinking the same thing. If the dilutions are made of the same solution, then why vary the wavelength? That and/or molar absorptivity should be the same, unless again, the samples are different. Also, no need to place the blank every time you run a sample made of the same solution (but only being diluted). Blank should be read again if you are running a different solution sample. Again, that's just me. I think they did these customizations for demonstration purposes.
The soundtrack tho 👌
Even the man looks like Animated AI robot
well explained
thats awesome!
but i wanna know why are we changing wavelength of light for same samples?
To get a different absorbance values and use it to plot your graph because in each wavelength length the value of absorbance will change.
Bery helpul in our chemistry class
Yes, if your concentration is higher, your absorbance will consequently be higher
Absorbance spectrum for red food colouring
How we evaluate concentration
❤
Sir I have a question ⁉️
1.If you tell the transmitted light in %....then absorbed light must be in %......but you taught absorbed in (nm) and transmitted in %
2..if 10% is transmitted then 90% should be absorbed or used anywhere else?
VEry nice bro
What will happen if you forget to wipe the cuvette before putting it in the spectrophotometer?
It will show wrong value.
Sir I want to check copper purity 99.99%. How to check this process.
the video was very very helpful to me.,i request maintenance guide about the
spectrometer video present
it.
Fascinating to see. Build one from paper on my channel 😂
Nice❤
Can you apload another video for polyvinyl alcohol
Watching in online practical )
you don't this manually in 2019???
lol why do you increse wavelenth by 25 each time
just partice?
nice..
purpose of blank?
What song is this ? Dammmn
استمر حبي
What's the purpose of blank here
I still don’t understand what we would do with these values
Why did we have to set the wavelength to specifically 380 nm?
why so serious?
how to analyze an unknown substance using spectrophotometry?
If you know what kind your unknown substance is like is it a protein or a reducing sugar, then prepare a standard curve of the substance (of known concentration) closest to your unknown substance, and then map it out.
@@ishanilahiri7387 hi thank you. i love u so much
It takes a lot of time make just one complete spectrum. It must be an old version of spectrophotometer or just a didactic one.
zodd0001 fking yeah, i build an automatic spectrophotometer in my bedroom pretty much the size of a cigarette box that can connect to my cellphone via non standard bitbanged infrared signals using an adaptor in the audio jack to send commands to the spec microcontroller and receive the digital data via the jack microphone input, i spend 50usd in it and the result is pretty much high grade lab quality.
Theoretically you can do the read using an USB sound adaptor and bypass the input cap on the microphone, then use the sound output of a moving loudspeaker with a prism glued on top to filter the light, and a photodiode in the mic input to read the level of absorbance on each wavelenght.
Score !
hi, why you test the sample again can you reply me
To measure absorbance and transmission at different wavelength
Looks like he knows what he's doing, but his data sheet is kinda sketchy. He's going to run into trouble when he's making the plot...
miklaszj non automatic spectrometer in 2018? You've gotta be kidding me, my DIY spectrometer cost $50 and does auto sampling directly to my cellphone screen, seriously, all of that user interaction and sample being completely taken in a different direction each time should make your results have a mount everest of error.
@@fss1704 What is your phone spectrometer like?
6:07 Organic biotags charging for fun
جميل
Dewissengi aga kasi bettuanna
My god, that machine looks older than me =P
I almost gonna sleep
0:16
I don't know about that data though...
1:20 looks like the guy from Jurassic Park
Show calculation part
عاش مال تقنيه 😂😂
PLEASE SEND ME SAME PROCEDURE FOR WATER FLUORIDE
Ilmunya sangat bermanfaat tapi sayang saya tidak bisa bahasa Inggris
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