松香中杂质铝脱除方法的研究

用作食品添加剂原料的松香，对含铝量有很高的要求，常规工艺生产的松香难以达到。研究了在不改变常规工艺的前提下,在熔解工段加入脱铝剂的化学脱铝法，得到了满意的结果。同常规工艺相比，可使松香中的铝含量质量分数由50×10-6(50PPm)降至1．0×10-6(1.0ppm)，脱铝率达98％。     

Estimation method of residual alkylating agents in water treated with chloring-containing oxidant

Concentrations of trace metals in mosses Hylocomium splendens (Hs) and Pleurozium schreberi (Ps) are compared along with wet deposition at 8 sites in Sweden. Cd, Mn, Zn and Cr concentrations were similar in both mosses, while Cu, Fe, Pb, Ni and V levels were 14 to 24% higher in Hs than in Ps. The comparison to wet deposition estimates indicates that concentrations in mosses are also influenced by other factors than the adsorption of precipitation. No correlation was observed between the wet deposition of Mn, Cr and Ni and moss concentrations.