SU813243A1 - Method of metallic silver determination in photographic materials - Google Patents
Method of metallic silver determination in photographic materials Download PDFInfo
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- SU813243A1 SU813243A1 SU792716014A SU2716014A SU813243A1 SU 813243 A1 SU813243 A1 SU 813243A1 SU 792716014 A SU792716014 A SU 792716014A SU 2716014 A SU2716014 A SU 2716014A SU 813243 A1 SU813243 A1 SU 813243A1
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Description
(54) СПОСОБ ОПРЕДЕЛЕНИЯ МЕТАЛЛИЧЕСКОГО СЕРЕ.БРА В ФОТОМАТЕРИАЛАХ(54) METHOD FOR DETERMINING METAL SILVER. BRA IN PHOTOMATERIALS
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Изобретение относитс к способам определени количества серебра в про вленном фотогра()ическом материале и может быть использовано в химической промышленности.The invention relates to methods for determining the amount of silver in the developed photographic material and can be used in the chemical industry.
Известен способ количественного определени содержани галогенида серебра в фотоматериалах, основанный на обработке образца фотоматериала аммиачно-тиосульфатным раствором и последующим псЭтенциометрическим титрованием полученного серебр но-тиосульфатного комплекса раствором тиомочевины l.A known method for the quantitative determination of silver halide content in photographic materials is based on the processing of a sample of a photographic material with an ammonia thiosulfate solution and subsequent PS ethometric titration of the resulting silver thiosulfate complex with a solution of thiourea l.
В св зи с тем, что в про влением фотоматериале содержитс только металлическое серебро, не образующее. тиосульфатного комплекса, определение серебра, по указанному способу невозможно.Due to the fact that the appearance of photographic material contains only metallic silver, which does not form. thiosulfate complex, the definition of silver, according to the specified method is impossible.
Известен также способ определени металлического серебра в про вленном фотоматериале путем нагревани до слабого кипени исследуемого образца с раствором азотной кислоты и последугадим колориметрическим определением содержани серебра в полученном растворе в присутствии эмульсионного сло и подложки 2.There is also known a method for determining metallic silver in a developed photographic material by heating the sample under test with a solution of nitric acid to low boiling and then determining by a colorimetric determination of silver content in the resulting solution in the presence of an emulsion layer and a substrate 2.
Наличие эмульсионного сло и подложки в анализируемом растворе не позвол ет достичь точности определени содержани серебра менее 6%, а дл фотоматериалов, имеющих подложку из бумаги, ошибка достигает 15%.The presence of the emulsion layer and the substrate in the analyzed solution does not allow to achieve an accuracy of determining the silver content of less than 6%, and for photographic materials having a substrate made of paper, the error reaches 15%.
Наиболее близким к Изобретению по технической сущности и достигаемому результату вл етс способ определе0 ни серебра в фотоматериалах, включающий обработку исходного материала смесью концентрированных серной и азотной кислот. Затем раствор титруют потенциометрически раствором галогенида кали з.The closest to the Invention to the technical essence and the achieved result is the method of determining silver in photographic materials, including the processing of the starting material with a mixture of concentrated sulfuric and nitric acids. Then, the solution is potentiometrically titrated with a solution of potassium halide.
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Недостатком известного способа вл етс низка точность определени , котора в случае больших количеств серебра (более 10 мг) составл ет 35% , а при уменьшении количества погрешность значительно возрастает. Способ требует продолжительной обработки в течение не менее 1 ч, а также предварительного отделени сло фото5 jграфической эмульсии обработкой образца этиловым спиртом и серным эфиром .The disadvantage of the known method is the low determination accuracy, which in the case of large amounts of silver (more than 10 mg) is 35%, and with a decrease in the amount of error increases significantly. The method requires prolonged treatment for at least 1 h, as well as preliminary separation of a layer of photo5 graphic emulsion by treating the sample with ethyl alcohol and sulfuric ether.
Claims (3)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SU792716014A SU813243A1 (en) | 1979-01-18 | 1979-01-18 | Method of metallic silver determination in photographic materials |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SU792716014A SU813243A1 (en) | 1979-01-18 | 1979-01-18 | Method of metallic silver determination in photographic materials |
Publications (1)
Publication Number | Publication Date |
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SU813243A1 true SU813243A1 (en) | 1981-03-15 |
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Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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SU792716014A SU813243A1 (en) | 1979-01-18 | 1979-01-18 | Method of metallic silver determination in photographic materials |
Country Status (1)
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SU (1) | SU813243A1 (en) |
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1979
- 1979-01-18 SU SU792716014A patent/SU813243A1/en active
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