Spectral absorbance of some aqueous solutions in the range 10-degrees to 40-degrees-C

Abstract

The effect of temperature upon the absorption spectr~ in the ultravio. let an~ part of the visible ranges was determined for several c~mpounds Jl1 aqueo~ls SOlutlOll. 1 e m.p e r~ tures used were 10 0 , 25 0 , and 40 0 C. The 1l1~ten al s used as solu tes JI1cludedbot h morgalllc and organic compounds, namely, potassium I1ltrate, potassIUm dIChromate, d lpl;enylsulfon e, diphenyl phosphate, 4,4'-diaminobenzophenone! and. m-creso]sulfonphthalem. As the temperature ,yas dec reased there was a n IIlcrease 111 l?aXlmU1l1. absorbance of all compol:llds except i n the case of dip henyl phosphate, the behavlOr of .WhlC!"t was anomalous. A slJght s hift of the absorbance curves also occurred. The relatlOns hlp betwee n absorbance and temperature was not linear in the temperature range i~v es tigated. The results showed that temperature shou ld be controlled within ± 2 deg. C If molar .absorbance values are to .be obtained within 0.5 perce nt. T emperature coeffiClents for an llldlvldua.l compound req uIre extensive absorption m easurements of that compound III k~lown medIa, and such coefficients wi ll hold for the sp ecifi ed wavelengths only under speC Ifi ed condItIOns. As a general guide the temperature shou ld be controlled to ± 0.5 d eg C.

Indoor heterogeneous photochemistry of molds and their contribution to HONO formation

“…Both solutions and extracted films showed similar trends (Figure S2). For the KNO 3 extracted films, a band centered at 300 nm was observed consistent with the literature 55 . For the molds extracted films, the UV spectrum shows a band with three large peaks: at 313 nm, 285 nm and 247 nm, which could be a combination of different compounds exhibiting various functional groups and conjugations.…”

“…For the KNO 3 extracted films, a band centered at 300 nm was observed consistent with the literature. 55 For the molds extracted films, the UV spectrum shows a band with three large peaks: at 313 nm, 285 nm and 247 nm, which could be a combination of different compounds exhibiting various functional groups and conjugations. As for the mixed extracted film of molds and potassium nitrate, a band centered at 292 nm was observed.…”

Indoor heterogeneous photochemistry of furfural drives emissions of nitrous acid

“…In fact, the range of wavelengths (335‐380 nm) emitted from the LED lamp used in this experiment does not allow the activation of the photochemistry of potassium nitrate. KNO 3 does not absorb significantly after 335 nm 56,57 …”

“…KNO 3 does not absorb significantly after 335 nm. 56,57 The amount of HONO produced was dependent on the quantity of furfural deposited, as measured by its initial concentration in the parent solution. An increase in the concentration of furfural from 0.05 to 0.5 mol L −1 with a concentration of 10 −1 mol L −1 of KNO 3 increased the formation of HONO by a factor of 10 (Figure 4A).…”

Dissociation of 4-chloro-4'-aminodiphenylsulfone

“…R eports have been published including the ultraviolet spectra, dissociaLion reactions, and the efl'ect of temper atures in the range of 10° to 40 0 C upon the spectra [2,3,4] . 'I'his papcr deals specifically with the acidic dissociation of the ammonium ion of 4-chloro-4'-aminodiphenylsulfone at 25 0 C, and with the effect of temperature upon its dissociation .…”