A uew diazoamino reagent 1-(4-antipyrinyl)-3-(3-Chlorophenyl)-triarene(APCPT)was synthesized. The colour reaction of APCPT with Hg(II) was studied. At pH=10,5~12.2, in the presence of Tween-80,APCPT reacts with Hg(II)...A uew diazoamino reagent 1-(4-antipyrinyl)-3-(3-Chlorophenyl)-triarene(APCPT)was synthesized. The colour reaction of APCPT with Hg(II) was studied. At pH=10,5~12.2, in the presence of Tween-80,APCPT reacts with Hg(II) to form a red complex witk higb sensitivity.The molar ratio of Hg(II) to APCPT is 1:2. The molar absorptivity is 1.87 × 105L . mor． cm-1.Beer's law is obeyed for Hg in the range of0-16μg/25ml展开更多
A new reagent,1(4 antipyriny1) 3(2,4-dinitropheny1)triazene(APDNBT), was synthesized in this lab and its analytical properties and its colour reaction with cadmium were studied.
In this paper meso-tetra (4-methoxyphenyl-3-sulpho) Porphine (TMPPS_4) was synthesized and its colour reaction with copper was studied. It was found to be a highly sensitive and highly selective reagent for the direct...In this paper meso-tetra (4-methoxyphenyl-3-sulpho) Porphine (TMPPS_4) was synthesized and its colour reaction with copper was studied. It was found to be a highly sensitive and highly selective reagent for the direct spectrophotometric determination of ultramicro amount of copper. The apparent molar absorptivity of the complex is 3.72×10~5L/mol·cm. Beer's law is obeyed for Cu(Ⅱ)of 0～1.4μg/10ml. The interference of 21 different ions and 6 kinds of salts were examined and found to be minimal. The complex formation of Cu(Ⅱ) with TMPPS_4 is generally slow at room temperature<<25℃>, but the reaction can be accelerated in the presence of NH_2OH·>HCl and completed within 5min. At PH 5.2 the Soret band of TMPPS_4 overlaps almost completetely with that of the complex. Therefore, the complex formation is taken to completion at this PH. Then the Soret band of TMPPS_4 shifted away from that of the complex by acidification. This simple and rapid method has been successfully applied to the direct determination of Cu in Al-alloys, industrial water, foods and human hair.展开更多
Maillard Reaction Products (MRP) was prepared from glucose and glysine heated at 90°C in air circulating oven for 12 hours. The effect of MRP on chlorophyll stability in green peas was investigated. The addition ...Maillard Reaction Products (MRP) was prepared from glucose and glysine heated at 90°C in air circulating oven for 12 hours. The effect of MRP on chlorophyll stability in green peas was investigated. The addition of Maillard Reaction Products (MRP) decreased the loss of chlorophyll a, chlorophyll b and total chlorophyll. The conversion of pheophytin and pyropheophytin were also reduced by the addition of MRP.展开更多
The synthesis of a new reagent 1-azobenzene-3-(5-nitro-2-pyridyl)-triazene(ABNPDT) and its colour reaction with cadimum were reported. At pH=10.40, in the presence of Triton X-100, ABNPDT react with cadimum to form a ...The synthesis of a new reagent 1-azobenzene-3-(5-nitro-2-pyridyl)-triazene(ABNPDT) and its colour reaction with cadimum were reported. At pH=10.40, in the presence of Triton X-100, ABNPDT react with cadimum to form a red Complex. The maximum absorption of reagent and complex are at 430nm and 520NM respectively. The molar absorpitivity is 2.0710 5L·mol -1 ·cm -1 . Berr’s law can be applied in the rang of 0～12μg/25ml. This method was used to determine tarce cadmium in water with satisfactory results.展开更多
文摘A uew diazoamino reagent 1-(4-antipyrinyl)-3-(3-Chlorophenyl)-triarene(APCPT)was synthesized. The colour reaction of APCPT with Hg(II) was studied. At pH=10,5~12.2, in the presence of Tween-80,APCPT reacts with Hg(II) to form a red complex witk higb sensitivity.The molar ratio of Hg(II) to APCPT is 1:2. The molar absorptivity is 1.87 × 105L . mor． cm-1.Beer's law is obeyed for Hg in the range of0-16μg/25ml
文摘A new reagent,1(4 antipyriny1) 3(2,4-dinitropheny1)triazene(APDNBT), was synthesized in this lab and its analytical properties and its colour reaction with cadmium were studied.
文摘In this paper meso-tetra (4-methoxyphenyl-3-sulpho) Porphine (TMPPS_4) was synthesized and its colour reaction with copper was studied. It was found to be a highly sensitive and highly selective reagent for the direct spectrophotometric determination of ultramicro amount of copper. The apparent molar absorptivity of the complex is 3.72×10~5L/mol·cm. Beer's law is obeyed for Cu(Ⅱ)of 0～1.4μg/10ml. The interference of 21 different ions and 6 kinds of salts were examined and found to be minimal. The complex formation of Cu(Ⅱ) with TMPPS_4 is generally slow at room temperature<<25℃>, but the reaction can be accelerated in the presence of NH_2OH·>HCl and completed within 5min. At PH 5.2 the Soret band of TMPPS_4 overlaps almost completetely with that of the complex. Therefore, the complex formation is taken to completion at this PH. Then the Soret band of TMPPS_4 shifted away from that of the complex by acidification. This simple and rapid method has been successfully applied to the direct determination of Cu in Al-alloys, industrial water, foods and human hair.
文摘Maillard Reaction Products (MRP) was prepared from glucose and glysine heated at 90°C in air circulating oven for 12 hours. The effect of MRP on chlorophyll stability in green peas was investigated. The addition of Maillard Reaction Products (MRP) decreased the loss of chlorophyll a, chlorophyll b and total chlorophyll. The conversion of pheophytin and pyropheophytin were also reduced by the addition of MRP.
文摘The synthesis of a new reagent 1-azobenzene-3-(5-nitro-2-pyridyl)-triazene(ABNPDT) and its colour reaction with cadimum were reported. At pH=10.40, in the presence of Triton X-100, ABNPDT react with cadimum to form a red Complex. The maximum absorption of reagent and complex are at 430nm and 520NM respectively. The molar absorpitivity is 2.0710 5L·mol -1 ·cm -1 . Berr’s law can be applied in the rang of 0～12μg/25ml. This method was used to determine tarce cadmium in water with satisfactory results.
