Absorbents in Microanalysis. III*. Lead Chromate as an External Absorbent in the Microanalysis of Chlorine, Bromine, and Sulphur

A simple method for microdetermination of chlorine and bromine is described. Halogens are absorbed by lead chromate at about 400°, and determined from the :increase of weight of lead chromate. It was found that at 4!00° microquantities of halogens catalyse quantitatively the oxidation of sulphur dioxide to sulphur trioxide; thus from the combined weight of the halogen and sulphur trioxide the percentage of sulphur and halogen can be calculated

Ispitivanje čvrstoće knjižnog bloka bešavne forme uveza ovisno o tehnici lijepljenja

U radu se bavimo određivanjem čvrstoće ručno izrađenih knjižnih blokova nastalih bešavnim uvezom kao najzastupljenijom formom uveza. Knjižni su blokovi izrađeni pomoću dva osnovna principa obrade knjižnog bloka za formiranje bešavnih knjiga: uz mehaničku obradu hrpta (hrapavljenje) ili bez mehaničke obrade (lepezasto lijepljenje). Cilj ovog rada je pobliže definirati potrebne alate i metode izrade knjižnog bloka za obje tehnike izrade knjižnih blokova, a glavni zadatak je ispitati čvrstoću nastalih knjižnih blokova. Nakon izvršenih mjerenja na kidalici (pull tester) IDM Page Pull Tester P0011 i sistematizacije rezultata, rezultati će se brojčano i grafički međusobno usporediti, uzimajući u obzir i standard FOGRA instituta - što će dovesti do zaključka koji način lijepljenja daje bolju čvrstoću knjižnog bloka

Survey of planar chromatography and HPLC research in Croatia from 1980-1998

The article presents the fundamental and applied research in planar and high-performance liquid chromatography in Croatia from 1980 to 1998. Fields and subfields of the investigations, as well as the places where they were done, are shown separately. Also, papers of individual investigators are elaborated. On the basis of the data presented, conclusions about the quantity and quality of the papers are drawn

Survey of Planar Chromatography and HPLC Research in Croatia from 1980–1998

The article presents the fundamental and applied research in planar and high-performance liquid chromatography in Croatia from 1980 to 1998. Fields and subfields of the investigations, as well as the places where they were done, are shown separately. Also, papers of individual investigators are elaborated. On the basis of the data presented, conclusions about the quantity and quality of the papers are drawn

A Simple Photometric Method for the Determination of Hydrazinophthalazines

An accurate and sensitive photometric method for the determination of hydrnzinophthalazines is described. The method is based on the formation of the yellow azine by the action of the acid solution of p-dimethylaminobenzaldehyde. The proposed method is successfully applied on the determination of 1-hydrazinophthalazine hydrochloride (I) and 1,4-dihydrazinophthalazine sulphate (II)

A Simple Photometric Method for the Determination of Hydrazinophthalazines

An accurate and sensitive photometric method for the determination of hydrnzinophthalazines is described. The method is based on the formation of the yellow azine by the action of the acid solution of p-dimethylaminobenzaldehyde. The proposed method is successfully applied on the determination of 1-hydrazinophthalazine hydrochloride (I) and 1,4-dihydrazinophthalazine sulphate (II)

Diacetamides. II. Syntheses and Properties of Some N,N-Diacylamino Esters

By using the 14 C-tracer technique it was established that the carbon dioxid e evolved in the reaction of ~ -ureido ester I with acetic anhydride originates from the carbonyl of the ureido group. N,N-Diacylamino esters and N-acylamino esters were also obtained from a -ureido ester II and acetic anhydride, as well as from propionic acid anhydri de and ~-ureido ester I. In addition N,N-dipropionyla mino ester VII and N-propionylamino ester VIII were synthesized from the corresponding ~ - am ino ester and N - carbony 1 ester, respectively. It was shown that the conversion of N, J· -diacylamino estern into the monoacylamino esters occurs readily if small amounts of acet ic and propionic acid, respectively, were present i n the boiling anhydride. Reduction of N,N-diacetylamino ester II w ith lithium aluminium hydride gave the dialkylamino alcohol XII