Performance of recovered and reagent grade electrolyte in a soluble lead redox cell
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A new glassified reagent for the detection of NAcetylβDGlucos aminidase in urine has been developed. The reagent was extremely stabilized at room temperature as compared with orginal liquid reagents. The reagent was more convenient and reliable when it was used in clinical diagnosis of renopathy.
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Benzoic acid
Reactivity
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Reagent adding is an important process in flotation.This article introduced a kind of control system for reagent adding in flotation process.The system use the image detection method to obtain the reagent dosage needed by flotation process,then adjust the reagent dosage by PLC,so to realize the automatic control of reagent adding in flotation process.
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Three types of Sb~Ⅲ reagents were studied.They are:(1)the compounds containing mer-
capto group,(2)Caille and Viel reagents and(3)the compounds containing two phenolic
groups in adiacent positions.
It was shown experimentally that the first two types of reagents give reactions with very
low selectivities.Moreover,the selectivities could not be improved by merely varying the structure
of the organic compounds.
The diphenolic compounds seem to be the most hopeful reagents for Sb~Ⅲ.Their reactions
are considerably selective.Several classes of coloured compounds containing two phenolic groups
in adjacent positions were prepared.Some of them were found to be satisfactory reagents
for Sb~Ⅲ.
Functional group
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Abstract The reaction of indoles with the Salkowski reagent has been examined. It was found that the concentration of acid as well as the concentration and anionic component of the iron salt employed are critical factors in the choice of a reagent that will fail to react—or will react maximally with a given indole. Tryptamine can be reproducibly assayed with a reagent containing 0.01 M Fe(NO 3 ) 3 in 7.0 M HCIO 4 . Two ml of this reagent are added to two ml of the sample. The absorbancy is read at 450 nm after 90 minutes under uniform light conditions. Versions of this reagent can also be used for the quantitative colorimetric determination of tryptophan or indoleacetic acid.
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Objective To evaluate the stability of the total bile acid reagent after opening the improved bottles.Methods We analyzed the total bile acid reagents in automatic biochemistry respectively by using the common reagent bottles and the improved reagent bottles.Observe daytime variation of CV and trend changes of high,medium mixed complex-value serum and reagent blank test results.Then t test was applied.Results (1)The change trend of the improved reagent bottles was significantly slower than that of the common reagent bottles,(2)The total deviations of common reagent bottles before and after monitoring were-20.37% and-22.09% respectively.Total deviations of the improved reagent bottles were 3.77% and-1.16% respectively,(3)The daytime variations of the common reagent bottles in complex-value were 9.27% and 9.32% respectively;the improved reagent bottles were 3.38% and 2.03% respectively;(4)The reagent blank with improved reagent bottles decline significantly slower than common reagent bottles;(5)The measured result of t test of the two kinds reagent bottles in the monitoring period was t=4.889,P0.01,the result there was significantly different.Conclusion The impvored reagent bottles have good performance to slow down the decay of total bile acid reagentand,and it′s suitable for extending the period of reagents′ validity.It can significantly reduce daytime variation.
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A recent increased attention is witnessed to the use of tetrachlorosilane (TCS), a cheap industrial intermediate, as a versatile reagent in organic synthesis. For example, TCS was used as an effective dehydrating agent, trans-silylating reagent and as a starting substrate for in situ preparation of other useful stoichiometric reagents in synthetic organic chemistry. Of these reagents TCS-NaI (Iodotrichlorosilane, ITCS), TCS-NaN3 (azidochlorosilanes) and TCS in combination with ZnCl2, Zn, KCN, Na2S and others. Some selected synthetic applications of TCS as dehydrating agent as well as one of its based "in situ" reagents (TCS-NaN3) are briefly highlighted herein.
Organic Synthesis
Stoichiometry
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Folin reagent was one of the most important reagents in protease determination. The differences between Folin reagent from laboratory and Folin reagent sold were studied. The results showed that there was not significant difference between the absorbance of Folin reagent from lab replaced 30d and Folin reagent sold (p<0.05). The RSD of Folin reagent from lab was between 0.3and 1.67, and Folin reagent sold between 0.63 and 1.49. The precision of them was both higher. The maximum absorption wave length of the chromogenic agent of Folin reagent was with 736-755. And there was no significant difference of the value of the same sample protease between both Folin reagent (p<0.05). Folin reagent from lab based on GB/T23527-2009 was perfect.
Chromogenic
Absorbance
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1. A new reagent for simultaneous decoloration and deproteinization of urine for the polarimetric determination of glucose has been described.2. The reagent consists of a 10 per cent suspension of active carbon in 15 per cent trichloracetic acid.3. The reagent does not adsorb glucose and is able to deproteinize urines with a concentration of up to 2 per cent protein. It gives clear and, almost always, colorless filtrates even with strongly colored urines.4. The new reagent has been compared with lead acetate as a decolorizing reagent and has been found superior to this reagent.
Suspension
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