Robyn Goacher

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@Forever1DFan100 2 ай бұрын

THANK YOU

@MandyH-yk1uy 4 ай бұрын

We love you

@user-rq6dx5ro3w 4 ай бұрын

nice explanation, very helpful, but what if the unknown matrix signal is negative, suppose -0.345 AU?

@Homme9 5 ай бұрын

It's really hard to believe that such great teachers exist in this broken education system. Ma'am, you are just awesome! Thank you for making these videos.

@robyngoacher8521 5 ай бұрын

Thank you - I appreciate the praise. Sadly, the broken education system drove me out of it and I work in industry now. But I did enjoy the teaching part of teaching!

@Homme9 4 ай бұрын

@@robyngoacher8521 You hang in there, Ma’am!

@nassimalijani8269 5 ай бұрын

This was perfect. Thank you so much.

@ThangPVan_ 5 ай бұрын

Hi, can I replace the concentration with the weight fraction?

@fatimabatool6530 6 ай бұрын

Book reference please

@juancocu 6 ай бұрын

Amazing explanation, thank you very much

@roritadrawingtuto5627 6 ай бұрын

Thank you so much

@niloofarkh4779 6 ай бұрын

thank u so much

@user-yb4dz7pl2h 7 ай бұрын

Can you add in Kw with the equation? Do I just need to add a 1/[H+]kw or something like in the charlot equation

@finno-px6of 8 ай бұрын

Amazing Video!!!

@Baesjegutten 8 ай бұрын

Thank you so much! The formulae always scare me, but this was a lot easier to understand than my lectures. I finally get it! (My exam is tomorrow lol)

@leiladerakhshan9881 10 ай бұрын

You are the best teacher😊

@woworo315 10 ай бұрын

Thank you so much for very helpful video! I have one question. If I got 90% recovery for my protocol. Then, I got 10 ug/kg for my sample. Do I have to calculate back to 100% because of my protocol can detect only 90%.

@laithanmar91 11 ай бұрын

You are genius

@pravingaonkar6292 Жыл бұрын

I think F value is wrong 😅 it's 1.25

@khalidhakimi4839 Жыл бұрын

Good

@ananyamohanty7088 Жыл бұрын

Thank you for the great video. While we are taking the dilution into account, won't we also consider the reduction in sample volume caused due to signal measurement? The V0 becomes a variable then..?

@robyngoacher8521 Жыл бұрын

Your question relates to whether "variable volume" or "constant volume" standard additions are done. In variable volume standard additions, the exact same solution is measured, spiked with standard, measured again, spiked with more standard and measured again (and so on). In that kind of standard addition, you cannot use a measurement technique that consumes sample. If you will consume the sample during measurement (even if that means losses due to transferring into and out of a cuvette for spectroscopy), then you should use constant volume standard additions. In constant volume standard additions, the V0 is the same for all flasks and you are able to do the math without needing to account for change in V0. So, no, the V0 does not become a variable. I hope that helps.

@serenesoulbd3487 Жыл бұрын

Nice

@terrycarver1255 Жыл бұрын

Wonderful presentation...very informative. Thank you

@styloxzvampire1283 Жыл бұрын

Is this is how we calculate GC yield?

@healthinsightsrothchildlll4402 Жыл бұрын

The volume is to low !!. Re do the Video. Thank you.

@engineeraqiii8649 Жыл бұрын

I think this formula you wrote incorrect. K= concentration/ Absorbance

@Shahidhsaraf Жыл бұрын

great work mam thank you so much

@lineakristensen1821 Жыл бұрын

Which text book are you using? I need to calculate an overlap integral for my BSc project. Thanks in advance.

@robyngoacher8521 Жыл бұрын

The book was Quantitative Chemical Analysis by Harris. Best of luck to you!

@lineakristensen1821 Жыл бұрын

@@robyngoacher8521 thank you. I really enjoyed your video 😊

@hazeldorothycesar5307 Жыл бұрын

thank you

@lramossanchez 2 жыл бұрын

Great, prof! New subs here

@hanstsahnang4533 2 жыл бұрын

Thanks for this awesome video. Are blank solutions also known as control solutions?

@robyngoacher8521 2 жыл бұрын

The wording isn't always clear when something is called a control. In biological and medical experiments in particular, the control is something that doesn't have the affect-so no treatment or no drug. In that way, the control is kind of like a blank. But in analytical chemistry, the blank does not contain the analyte while control solutions contain the analyte in a known quantity. Therefore the blank provides information about the background and the control is used for checking if your method produces the right concentration of analyte. I hope that makes sense and answers your question.

@hanstsahnang4533 2 жыл бұрын

@@robyngoacher8521 thanks mom. Is very clear now

@haydenrogers5440 2 жыл бұрын

Is there a difference between matrix effect and recovery percent, or are they one in the same?

@robyngoacher8521 2 жыл бұрын

Matrix effect is the concept that analytes will respond differently in different systems. Spike recovery is the most common way to measure whether a matrix effect is present. If the spike recovery is close to 100%, then you can conclude that the analyte behaves the same in your sample (which is spiked) as it did in the set of simpler solutions used for calibration. I hope that helps.

@thecasualfront7432 2 жыл бұрын

just what i needed, thanks

@AnujSharma-hy1nn 2 жыл бұрын

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@contehspecial8824 2 жыл бұрын

In some cases the spike sample is about 50 to 100 times the known concentration. I analyze Cocoa samples I was at first having a problem with spike but following the 50 to 100 times I got my results

@gashayeyalew 2 жыл бұрын

you.talk.so.fast

@mahditabatabaee5880 2 жыл бұрын

Many thanks

@ntandazo5404 2 жыл бұрын

❤️💯 the way you just saved me from studying this topic all over again from scratch 😃

@sattibabvanumu8612 2 жыл бұрын

would be able to help me clear my doubts that what factors decide the type of calibration either linear or logit calibration? and also what determines number of standards required for an assay calibration?

@justineninoinocencio6109 2 жыл бұрын

IS murexide Triprotic?

@esthermarie7721 2 жыл бұрын

Thank you so much

@minhazulislam9131 2 жыл бұрын

You saved me. Thank you so much.

@user-ek1dk7zc6g 2 жыл бұрын

Oh, dear, this is what I urgently need to learn. Thank you very much

@user-ym6xc2ez5u 2 жыл бұрын

You are so cute！！

@abdulsarwary8764 2 жыл бұрын

can you speak louder i cant hear you

@soundravallyrajendiran5694 2 жыл бұрын

Great lecture. thanks. can you please post the links of other 3 related videos here

@junaidrehmani9829 2 жыл бұрын

Hi Robyn would you refer to a source to help with determining pre validation parameters in a lab?

@FieldsWalker 2 жыл бұрын

Thank you! What book can you recommend to read about general principles of chromatography?

@robyngoacher8521 2 жыл бұрын

Any edition of Harris's Quantitative Chemical Analysis provides a good basis.

@robyngoacher8521 2 жыл бұрын

chem.libretexts.org/Bookshelves/Analytical_Chemistry/Supplemental_Modules_(Analytical_Chemistry)/Analytical_Sciences_Digital_Library/JASDL/Courseware/Teaching_Instrumental_Analysis_without_a_Textbook is also a great free online resource

@SG73088 2 жыл бұрын

@@robyngoacher8521 Fantastic lecture. Please take lecture on Preparative HPLC and spectroscopy.

@ala7515 2 жыл бұрын

Thank you - very helpful!

@drelizabethomindeogaja2335 2 жыл бұрын

Wonderful video. Which textbook would you recommend for pharmacy undergraduate students

@christopherlarson4271 2 жыл бұрын

She is pretty 😃

@rithika06 2 жыл бұрын

Improve audio quality

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