You don't have 10 digits (fingers) you have 9, natures binary code 1 switch 2 functions (Zepherium, Zero) serves as both the 0 & the 10 , 0123456789 (10 digits)
In the presence of light (the UV light), H2O2 spontaneously decomposes into water and oxygen.
Chemical reactions in which, a single substance splits up into two or more simpler substances are called decomposition reactions. These reactions are carried out by energy, supplied by different sources. The required energy can be supplied by heat (thermolysis), electricity (electrolysis), or light (photolysis).
Letโs talk about photolysis reactions (not photosynthesis): Photolysis (also called photodissociation and photodecomposition) is a chemical reaction, in which a chemical (an inorganic or an organic) is broken down by photons and is the interaction of one or more photons with one target molecule. The photolysis reaction is not limited to the effects of visible light, but any photon with sufficient energy (higher than the dissociation energy of the targeted bond) can cause the chemical transformation of the said (inorganic or organic) bond(s) of a chemical. Since the energy of a photon is inversely proportional to the wavelength, electromagnetic waves with the energy of visible light or higher, such as ultraviolet light, X-rays, and ฮณ -rays, can also initiate photolysis reactions.
Like all other peroxides, hydrogen peroxide (H2O2) also consists of a relatively weaker OโO bond, which is susceptible to light or heat.
The net equation for the reaction is:
2H2O2โถ2H2O+O2
The step-wise reaction mechanism is suggested as follows (Ref.1):
H2O2+hฮฝโถ2HOโ
HOโ+H2O2โถHOโOโ+H2O
HOโOโ+H2O2โถ2HOโ+H2O+O2
Using isotope studies it was confirmed that the O2 formed is cleanly derived from H2O2 (Ref.2).
Notes: The rate increases rapidly in the presence of catalysts such as MnO2 and KI (Ref.2). The rate of decomposition is slow at room temperature, but it increases with temperature. It is believed to be due to thermal decomposition of H2O2, which seemingly accelerates the photolysis (Ref.3).
References:
1.J. P. Hunt, H. Taube, โThe Photochemical Decomposition of Hydrogen Peroxide. Quantum Yields, Tracer and Fractionation Effects,โ J. Am. Chem. Soc. 1952, 74(23), 5999โ6002 (https://doi.org/10.1021/ja01143a052).
2.A. E. Cahill, H. Taube, โThe Use of Heavy Oxygen in the Study of Reactions of Hydrogen Peroxide,โ J. Am. Chem. Soc. 1952, 74(9), 2312โ2318 (https://doi.org/10.1021/ja01129a042).
3.F. O. Rice, M. L. Kilpatrick, โThe Photochemical Decomposition of Hydrogen Peroxide Solutions,โ J. Phys. Chem. 1927, 31(10), 1507โ1510 (https://doi.org/10.1021/j150280a004).
Interestingly, as early as 1934 Haber and Weiss (Ref. 1) proposed that HO2โ is formed in the decomposition of hydrogen peroxide.
The subsequent reaction of the transient superoxide radical anion with hydrogen peroxide has been determined to also form the hydroxyl radical (Ref. 2). The higher pH version of the last reaction is, therefore, best represented as:
O2โโ+H2O2โถ2HOโ+OHโ+O2
And as H++OHโ=H2O, the net product formation is not altered. However, alkaline H2O2 is well known to be less stable than acidic hydrogen peroxide (Ref.3) even in absence of light exposure, which accelerates its decomposition (which can involve radical pathways) liberating oxygen!
References:
1.Haber Fritz and Weiss Joseph, 1934, The catalytic decomposition of hydrogen peroxide by iron salts. Proc. R. Soc. Lond. A 147: 332โ351 http://doi.org/10.1098/rspa.1934.0221
2.TOSHIHIKO OZAWA, AKIRA HANAKI, Reactions of Superoxide with Water and with Hydrogen Peroxide, Chemical and Pharmaceutical Bulletin, 1981, Volume 29, Issue 4, Pages 926-928. https://doi.org/10.1248/cpb.29.926
3.https://www.researchgate.net/figure/Effect-of-pH-on-the-decomposition-of-hydrogen-peroxide-H-2-O-2-0-800-mg-l_fig1_234110563, from Yazฤฑcฤฑ, Ersin & Deveci, Haci. (2010). Factors Affecting Decomposition of Hydrogen Peroxide. https://doi.org/10.13140/RG.2.1.1530.0648.
Photosynthesis Law of Limiting Factors
Light Intensity
Light Wavelength
Duration of Light
Carbon Dioxide
Temperature
Water
Oxygen (Rootzone)
Oxygen (Stomata)
The factor which is shortest in supply can limit the rate of photosynthesis. Thus comprehend that when there is more than one factor in the process of photosynthesis, the rate is mostly affected by a factor that has a minimum supply.
Once carbon dioxide is peaked, raise temps to 86 to maximize leaf surface temperature to achieve optimal photosynthesis. Oxygen to the root zone will always be the limiting factor in growth after co2 peaks and temps are adjusted.
@Ultraviolet, it looked a bit pink-ish to me. Some photographers use wavelengths during the shot that bring out certain features. The composite photos made out of different wavelengths are quite pretty.
@NegotiatedBubble, Urm I harvested the main flowers and left a few popcorn nugs at the bottom of the plant then put it back to veg, the bottom pictures are taken under a full spectrum lighting 400-700nm, heavily damaged from UV exposure PH tomfoolery.
An excellent article on Blue.
Many Thanks. Since I started playing with the other colours its nice to see the info getting out there. I'm completely convinced with adding more of the spectrum.
I would love to see a well controlled comparative grow between with and without adding the blue or extra colours using a typical grow light like from Spider Farm or similar as a base.
And thanks for all the links to those papers.
@TheFattyMcCoy, These are some clones from a previous grow, was meant to be a comparison between monster-cropped clones at varying stages of flower but they at this stage are growing equally well I can't tell the difference tbh.