TLV-TWA air 2 mg/m3 (OSHA); ceiling
2 mg/m3 (ACGIH) and 2 mg/m3/15 min
(NIOSH).
物理描述:
Sodium hydroxide solution appears as a colorless liquid. More dense than water. Contact may severely irritate skin, eyes, and mucous membranes. Toxic by ingestion. Corrosive to metals and tissue.
颜色/状态:
White, orthogonal crystals
气味:
... Odorless ...
味道:
Detection - the minimum physical intensity detection by a subject where he or she is not required to identify the stimulus but just detect the existence of the stimulus - in water: 8.00X10-3 mol/L.
蒸汽压力:
1.82X10-21 mm Hg at 25 °C /extrapolated/
稳定性/保质期:
CONTAINERS OF LYE MUST BE TIGHTLY CLOSED TO PREVENT CONVERSION TO SODIUM CARBONATE BY CARBON DIOXIDE OF AIR.
自燃温度:
Not flammable (USCG, 1999)
分解:
When heated to decomposition it emits toxic fumes of /sodium oxide/.
粘度:
4.0 cP at 350 °C
腐蚀性:
Very corrosive (caustic) to ... aluminum metal in presence of moisture
There are no quantitative data for the absorption of sodium hydroxide through the skin. Solutions which contain 50 % sodium hydroxide have been shown to be corrosive and lethal when applied dermally to mice.
Gas phase kinetics of the reactions of NaO with H2, D2, H2O, and D2O
摘要:
The gas phase reactions of the NaO radical with H2, D2, H2O, and D2O were studied in a flow tube reactor at room temperature. The reaction of NaO with H2 has two exothermic product channels, NaOH+H and Na+H2O. Both channels were observed and the Na formation channel produces some Na in the 32P state. The rate constants for the abstraction channel for H2 and D2 reactants are (2.6±1.0)×10−11 and (1.1×0.4)×10−11 cm3 molecule−1 s−1 at 296±2 K. The reaction of NaO with H2O was shown to be second order and the products are assumed to be NaOH and OH. The rate constants for H2O and D2O reactants are (2.2±0.4)×10−10 and (1.2±0.2)×10−10 cm3 molecule−1 s−1 at 298±1 K. The measured NaO+H2O rate constant is compared to the predicted collision rate constant from a model based on the large attractive dipole–dipole force between NaO and H2O. The role of these reactions in mesospheric Na chemistry is briefly discussed.
Determination of the absolute third-order rate constant for the reaction between Na + OH + He by time-resolved molecular resonance-fluorescence spectroscopy, OH(A<sup>2</sup>∑<sup>+</sup>–X<sup>2</sup>Π), coupled with steady atomic fluorescence spectroscopy, Na(3<sup>2</sup>P<sub>J</sub>– 3<sup>2</sup>S<sub>1/2</sub>)
作者:David Husain、John M. C. Plane、Chen Cong Xiang
DOI:10.1039/f29848001619
日期:——
signal averaging. Na(3 2S1/2) was monitored in the steady mode using atomic resonance fluorescence at λ= 589 nm [Na(3 2PJ)–Na(3 2S1/2)] coupled with phase-sensitive detection. The following absolute third-order rateconstant (T= 653 K) was obtained: k1(Na + OH + He)=(1.07 ± 0.21)× 10–30 cm6 molecule–2 s–1. Quantitative extrapolation to high temperatures using the unimolecular reactionrate theory developed
我们提出了Na + OH + He→NaOH + He反应的绝对三阶速率常数的第一个直接测量值。OH(X 2 Π)通过H的重复脉冲照射而产生的2通过的CaFø蒸气2个在他的存在下和过量从热管烤箱衍生原子钠的光学器件和一个缓慢的流动系统的,包括一部分,在动力学上等同于静态系统。基态OH通过时间分辨分子共振荧光在监测λ = 307纳米[OH(阿2 Σ + - X 2以下使用预触发光电倍增门控,光子计数光激发和,(0,0)Π)]信号平均。钠(32 š 1/2)中的溶液在使用原子共振荧光稳定模式在监测λ = 589nm处的[Na(3 2 P Ĵ)-Na(3 2 š 1/2)]加上相敏检测。得到以下绝对的三阶速率常数( T = 653 K): k 1(Na + OH + He)=(1.07±0.21)×10 –30 cm 6分子–2 s –1。使用Tröe开发的单分子反应速率理论对高温进行定量外推可得出结果k