Molecular Formula | (NH4)2C2O4·H2O |
Molar Mass | 142.11 |
Density | 1.5 |
Melting Point | 133 °C (dec.)(lit.) |
Boling Point | 259.65°C (rough estimate) |
Water Solubility | 45 g/L (20 ºC) H2O: 0.1 M at 20 °C, clear, colorless |
Solubility | Soluble in water, slightly soluble in alcohol, insoluble in ammonia, soluble in 20 parts of cold water, 2.6 parts of boiling water. |
Appearance | White crystal |
Storage Condition | Room Temprature |
Sensitive | Easily absorbing moisture |
Refractive Index | 1.45 |
MDL | MFCD00149694 |
Physical and Chemical Properties | Store at 5°C to 30°C. Chemical formula (NH4)2C2O4. H2O. Molecular weight 142.11. Colorless orthorhombic crystals. Toxic! No exact melting, boiling point, relative density 1.50, refractive index 1.546. Soluble in water, slightly soluble in alcohol, insoluble in ammonia. Heat to 95 deg C dehydration, high temperature decomposition of carbon monoxide, carbon dioxide and ammonia. It can be reacted with other metal salts to form less soluble oxalates. Such as its aqueous solution with soluble calcium salt can form a white precipitate, can also be used as a ligand with the transition metal salt to form oxalate complexes. Preparation Method: by oxalic acid and ammonia (or ammonium carbonate) by crystallization. |
Use | Purposes: for the preparation of iron tin dye, organic synthesis of raw materials, and for the determination of calcium, lead and rare earth metal ions and metal polishing agent. |
Hazard Symbols | Xn - Harmful |
Risk Codes | R21 - Harmful in contact with skin R22 - Harmful if swallowed |
Safety Description | S24/25 - Avoid contact with skin and eyes. |
UN IDs | UN 1759 8/PG 3 |
Abstract:
In this paper, the direct determination of trace cadmium in soil floating liquid by graphite furnace atomic absorption spectrometry is studied. Influence of different matrix modifiers and background absorption of comparator on measurement. The stability of the suspension was studied by using ammonium oxalate as a stabilizer. The results showed that the soil suspension was stable under alkaline conditions with 0.007mol · L ^-1 ammonium oxalate as a stabilizer. A method for the direct determination of trace cadmium in soil samples by solid suspension sampling was developed.Key words:
suspension sampling; Ammonium oxalate; Cadmium; determination; Soil; Atomic absorption spectrometry
DOI:
10.2190/K5DG-LENJ-AMDR-591P
cited:
year:
1999
CN 02803728
application date:
Jan 4, 2002
Public/Announcement Number:
CN 1486505 A
applicant (patent):
Cabot Microelectronics Corporation
inventor:
Homer Joe , Joseph D. Hopkins Zhou Renjie
National and provincial code:
United States
cited:
Abstract:
The present invention provides a Polishing System and method for substrate polishing or planarization. The polishing system comprises (I) a liquid carrier,(ii) Ammonium oxalate,(iii) a hydroxyl coupling agent, and (iv) a polishing pad and/or abrasive. The polishing method includes contacting at least a portion of the substrate with a polishing system and simultaneously polishing a portion of the substrate.
sovereignty:
1. A system for polishing a substrate comprising (I) a liquid carrier,(ii) Ammonium oxalate,(iii) a hydroxyl couple, and (iv) polishing pads and/or abrasives.
Huang Yongchun , Yang Feng , He Ren , Cheng Qianwei , leweiping
Abstract:
The ammonium oxalate countercurrent extraction method was used to extract pectin from the fresh fruit peel of Passiflora edulis. The Effects of countercurrent extraction series, temperature, ammonium oxalate concentration, solid-liquid ratio and reaction time on the yield of pectin were investigated, the technological conditions were optimized, and the optimum conditions of ammonium oxalate countercurrent extraction method for extracting pectin from the peel of Passiflora edulis were obtained: The countercurrent extraction order was 3, the temperature was 90 ℃, and the concentration of ammonium oxalate was O.45%, the ratio of Peel mass to ammonium oxalate volume was 1:35, and the extraction time was 5.5h. Compared with the traditional acid extraction, the yield was increased from 2.22% to 3.82%, and the quality of the prepared pectin was determined. The results showed that the yield and quality of pectin by ammonium oxalate countercurrent extraction method were better than those by traditional acid method.
Key words:
pectin; Passion fruit peel; Ammonium oxalate; countercurrent extraction method
DOI:
10.3321/j.issn:1002-6630.2008.09.048
cited:
year:
2008