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| 楼NO.10573 发布时间：2025/9/27 7:42:13 |
Metandienone Wikipedia
Atrazine _ General Overview
Atrazine (2-chloro-4-(ethylamino)-6-(isopropylamino)_1,3,5_triazine) is a widely used
herbicide that suppresses the growth of annual grasses and broadleaf
weeds in crops such as corn, sugarcane, sorghum, and some horticultural commodities.
Its mode of action involves inhibition of photosynthetic electron transport
(specifically blocking plastoquinone reduction), thereby preventing photosynthesis in susceptible weed species while leaving most crop
plants largely unaffected due to their lower sensitivity or different
growth stage at application.
---
I. Chemical Properties
Property Value / Description
Molecular formula C_H_N_
Molecular weight 169.18 g_mol_?
Appearance Colorless to pale yellow crystals (solids)
or clear colorless liquid; in commercial formulations typically
white powder.
Solubility Insoluble in water (<0.1 mg_mL_?. Soluble in organic solvents: acetone, ethanol, methanol, DMSO, and especially in petroleum distillates (e.g., kerosene, mineral oil).
Acid_base behavior Weakly acidic; pKa of the imide proton ~9.5. The compound can act as a mild ligand for transition metals via its carbonyl groups.
Thermal stability Decomposes above 300_癈. Sublimes at ~230_癈 under reduced pressure. No significant thermal decomposition until >250_癈.
Photochemical behavior Photostable in UV/visible
range; no strong absorption below 350_nm, so minimal photodegradation under typical laboratory illumination.
---
2. Potential Chemical Interactions with the Sample
Interaction Likelihood Impact on Measurement
Acid_base neutralization (sample pH ~4_6) Medium Minor, could shift local equilibrium if
sample contains weak acids/bases; not expected to produce measurable signals.
Redox reaction with oxidizable analytes Low Sample may
contain antioxidants or reducing agents that could reduce the anhydride;
but no strong oxidizing species present.
Hydrolysis to maleic acid (in presence of water/acid) Medium Maleic acid
formation is a reversible reaction; however, in dilute aqueous solution equilibrium favors
anhydride at neutral pH and low ionic strength.
Complexation with metal ions (e.g., Ca瞋, Mg瞋) Low No high-affinity complexes known between maleate and
common divalent cations under neutral conditions.
Interpretation: The most plausible interference is the hydrolysis of maleic anhydride
to maleic acid, which could shift the equilibrium toward
the open form, thereby reducing the concentration of the species responsible for the observed optical activity.
---
3. Quantitative Estimation of Maleate Concentration in Solution
Given:
Initial maleic anhydride mass: 0.1_g
Density (maleic anhydride): \( \rho = 1.24~\textg/mL \)
Solution volume: 10_mL of water
Step_by_step calculation:
Step Description Calculation
1 Convert mass to moles (using molar mass \(M = 100.06~\textg/mol\)) \( n = \frac0.1~\textg100.06~\textg/mol = 9.99\times10^-4~\textmol \)
2 Compute concentration in mol/L (Molarity) \( C =
\fracnV_\textL = \frac9.99\times10^-4~\textmol0.01~\textL =
0.0999~\textM \approx 0.1~\textM \)
3 Convert to mol/m?(SI units) \( C_\textm^-3 = C\times10^3=99.9~\textmol/m^3\approx100~\textmol/m^3 \)
Result
The concentration of the dissolved substance in the 0.01_L sample is
[
C \simeq 1.0\times10^-1\;\rm mol\,L^-1
= 1.0\times10^2\;\rm mol\,m^-3 .
]
(If you need a different unit, just multiply or divide by the appropriate factor.)
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| 楼NO.10574 发布时间：2025/9/27 7:41:55 |
prednisone side effects after stopping use
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| 楼NO.10575 发布时间：2025/9/27 7:41:32 |
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