milesmiles902

You're right. He could do something fancy, such as not have the lamp on (cover the entrance with card stock) and shine the LED into the detector above the cuvette. If the detector becomes over-saturated with light, then hold the LEDs farther away. It probably would work with water in the cuvette. The LEDs have a sharp emission around limited wavelengths that water shouldn't absorb. Then, as stated earlier, can also be used for testing water samples. All you need is the detector to do what you are saying. The tungsten-lamp is used to specify and emit wavelengths for wide-spectrums, similar to the LEDs, except LEDs are commonly a sharp spectrum for small-detection. I bet it would work with some straight-forward and non-destructive finagling. As said, the problem is emission vs absorption detecting. Adafruit has some wavelength and rgb value detectors, which can also be used for the emission and likely LEDs: https://www.adafruit.com/category/61

At a concentration of zero, what should be the absorbance? That's all that needs to be said. Happy 4th of July! Eat a steak for America!

In my experience of being a PhD graduate student in physical chemistry, also publishing and specifically studying spectroscopy across many different types of the electromagnetic spectrum, along with how this equation was derived. Theory is what made good practice and good practice comes from accepting theory. Concentration within a solution is a linear process and because your dilutions or solution making was not accurate in all experiments to the significant figures specified. You either can't trust your data or have to add a standard deviation bar to your plot, which is the only way to accept this data. The standards across many fields have become lenient, but coming from the field of chemistry that defined and made this equation. It is required to either re-make your stock-solutions or make the y-intercept zero. We also teach this in general chemistry with similar spectrophotometers. I am positive that in the field of environmental chemistry, which is what you are achieving. They will do the same. The difference between our arguments is accuracy, which is cool. I love your work. Keep it up! I wish I had a spectrophotometer to do similar work.

Actually, @pdxmonkeyboy Be honest. Did you take this picture?

Just to be careful on the quality of your data. Beer-Lambert's Equation does not have a y-intercept. You should always fix it to 0 in Excel. The form is y=mx where y=A, m=epsilon*l and x=c. Epsilon is the slope because your cuvettes have a width of 1 cm. On the low-level concentrations a y-intercept of non-zero, will demonstrate a deviation from the real concentration, which is the most common areas of measurement in aquariums. Keep up the cool experiments, but be careful on your data. A b-value of -0.02 could represent 10-20% deviation on a concentration below 0.25 ppm.

I'll let this one slide @pdxmonkeyboy It is qualified to be a coral and a plate.

What's the stock model on that spectrophotometer?

Here are the rules: • One photo entry per person • Pic has to be taken by you • Must be in by the posted deadline • Must follow subject guidelines for the month Winners will be determined based upon a voting poll with results after the submission deadline. This months subject: Plate Corals. Deadline: August 1st, 11:59 pm

Please vote once! Voting Closes: July 7th @ 11:59 pm

Pro

It depends on how much time you have. Safer is better and honestly, the easiest way is to break the rock.

The Ottoman empire lasted 1292-1922. Up till the 1700's, it was a completely different world than the 2.08 stat you listed. Also, there was a lot of slavery involved. How's the tank going?

https://www.gazettetimes.com/news/local/newly-discovered-fish-named-for-osu-scientist/article_f9c7374e-8dbc-54e9-b89a-fa860d507594.html

It's a rough road. It puts a lot of stress on you. It gives you wrinkles, adds 25 years to photos and 5 years to real-life. At that point, age just becomes a number and there's no benefit from it, except being a bit closer to social security and retirement. It also allows you to look back and say I helped the world for a portion of my life.

Maybe you're right. I just feel it has bad connotations. I didn't report you to the forum gods. Apparently, Wikipedia says this is common for many groups of animals. https://en.wikipedia.org/wiki/Harem_(zoology) I just wish it was different. It has a bad rep in human history, especially with certain religions, but it is the correct word. I hope your clownish breeding works out well. I was never successful.

I respect @Flashy Fins for being the only woman to stand-up against these men. Congratulations to all of you. @Flashy Fins stay strong.

Please don't call them a Harem on this forum.

I don't think they preferred to be called geriatrics.

Bump

I can't see the colors, but the structure looks like a tri-color acropora: https://bit.ly/2IwUP8t

This is the best post I've seen from most in a while.

It takes week to cycle a tank Larger water changes, less often are better Fish only grow till the size of the tank You need to siphon the sand

Ladies and Gentlemen...will you please rise - as we ask you to please remove your hats...as we honor America with the performance of our national anthem... And now for tonight's starters, first visiting the Pacific Northwest. At the forward, from Oregon, 6'1" from Paradise Corals, #8 MrBret At center, from Oregon, somewhere between 5ft and 6 and a half ft tall, from the Sexton Mountains, #9 SuncrestReef. And at guard, from Portland, Oregon, #12, What_the_Frag The head coach for the PNWMAS Corals is Salted_Waffles. Presented by Budweiser - the best way to keep the Corals on the road. Come out and join us at the sidelines sports bar and grill on Sunday night - June 30th. Attention fans, N-C-A-A tie-breaker rules will apply as a result of this potential tie score. Team captains will report to mid-field for a coin toss. The winner of the toss may select to be on either offense or defense. Stick around after the game to get your chance to get some autographs from your favorite Corals players - Compliments of Mountain Dew will be served. Play Ball!!!

Yeah, I wasn't sure if it was a lobo or a baby 1-2 polyb acan.

BREAKING NEWS!!! The Philadelphia zoo has suffered a dramatic loss of it's most important attraction, yes, the beloved corneous dogious, or as it was affectionately known, Corn Dog. On a side note, there has been eye witness reports of an ongoing dispute amongst the photography community. We have been told the death toll continues to rise by a very serious photographer named the elusive - NanoReefer. We have a reporter on site to let us know what is happening on the streets of PNWMAS. "Sharron, over to you." "Yes, Tom, The death toll continues to rise from the number of photographers running to into popcorn stands without any awareness of where they are going. It's madness out here. They are all trying to compete for to be the best photo-thread and without food, water and sleep. It has become a tragic event." "Sharron, what do you think the death toll has become" "Tom, without counting, I almost think it has become an entire PNWMAS Main Category. A staple to our local community. It's a circus out here, Tom" - "Well, you heard it from Sharron. It's a real circus out there. Stay tuned for the Channel Eight News Coverage and the latest breaking news spread across our forum"