НИТРАТ ПРАЗЕОДИМА

Description

Praseodymium nitrate is a hydrated salt of trivalent praseodymium and nitric acid. The formula on the card H10N3O14Pr corresponds to the pentahydrate Pr(NO₃)₃·5H₂O. The product item combines several forms of delivery, reflected in the synonymous row: crystalline praseodymium (III) nitrate with a purity of 99.9%, praseodymium (III) nitrate pentahydrate with a purity of 99.9%, 99.90% and 99.95%, praseodymium nitrate hexahydrate 99.9% (REO), as well as a standard solution of praseodymium for atomic absorption spectroscopy with a concentration of 1 mg/ml Pr in 2% nitric acid. Green crystalline powder is the characteristic color of compounds of the Pr³⁺ ion. The main purpose is a soluble source of praseodymium: obtaining the oxide by calcination, impregnation of catalyst supports, introducing the element into glass and ceramic glazes, synthesis of phosphors, calibration of analytical instruments.

Basic Attributes

• CAS No: 14483-17-1
• Chemical formula: H10N3O14Pr
• Molecular weight: 417
• Exact weight: 416.924
• DSSTox ID: DTXSID20162816
• PSA Specs: 252.79
• XLogP3: 0.5308

Physico-chemical characteristics

• Appearance: green crystalline powder
• Boiling point: 83 °C at 760 mm Hg. Art.

The value of 83 °C describes the beginning of the elimination of water of crystallization when the crystalline hydrate is heated, and not the boiling of the salt in the usual sense. Hence the requirement for the tightness of the container: the loss or gain of moisture shifts the degree of hydration and, accordingly, the praseodymium content in the sample. For forms supplied as standard solutions, this problem is eliminated - the concentration is specified and indicated in the passport.

Delivery form for analytics

A standard praseodymium solution for AAS contains 1 mg/ml Pr in 2% nitric acid. The acidic environment here is not accidental: it prevents hydrolysis and precipitation of the rare earth hydroxide and ensures stability of the concentration during the shelf life. Such solutions are used to construct calibration curves when determining praseodymium using atomic absorption spectroscopy and ICP methods.

Purity and its designation

The 99.9%, 99.90% and 99.95% labels refer to the praseodymium content of the rare earth elements; REO indicates conversion to oxides. A separate gradation “based on trace elements” (trace metals basis) normalizes the content of not rare earth, but other metal impurities - this grade is taken where background purity is critical, for example, in analytical and semiconductor applications.

Hazard classification

• Hazard class code according to the previous system: 8, 36/37/38
• Safety instructions: 17, 26, 36/37/39

The GHS classification, H phrases and P measures are not included in the original product data sheet and are not listed here. They are taken from the safety data sheet for a specific batch.

Transportation

• Transport code: 1477

Number 1477 in the UN list corresponds to inorganic nitrates of class 5.1 - oxidizing substances.

Storage and handling

Like other nitrates, the compound acts as an oxidizing agent: separate storage with organic substances, reducing agents, sulfur and phosphorus is mandatory; instruction 17 directly requires keeping the substance away from flammable materials. The warehouse is dry, ventilated, the containers are tightly closed and protected from mechanical damage. Codes 36/37/38 indicate an irritant effect on the skin, eyes and respiratory tract, so work is carried out with gloves, safety glasses and protective clothing, and when pouring powder, use respiratory protection (instructions 26, 36/37/39). In case of contact with eyes, immediately rinse with plenty of water and seek medical attention.