本文以红提葡萄为试材，研究不同浓度焦亚硫酸钠（Na2S2O5）浸泡处理对其贮藏过程中部分生理生化指标的影响。结果表明，Na2S2O5浸泡处理对葡萄贮藏过程中的失重、腐烂、呼吸强度和可溶性固形物的降解均有一定的抑制作用，且在实验范围内Na2S2O5浓度越大，抑制效果越明显；另外，Na2S2O5浸泡处理可降低多酚氧化酶（PPO）的活性。因此，Na2S2O5浸泡处理对红提葡萄具有较好的贮藏效果。

The effect of different concentrations of Na2S2O5 soaking treatments on the postharvest physiologic and biochemical characteristics of red grapes was studied in this paper. The results indicated that Na2S2O5 soaking treatments inhibited weight loss, rot, respiration rate, as well as degradation of soluble solids during storage. The higher concentrations of Na2S2O5 were treated, the strongerinhibitory effect they owned. In addition, Na2S2O5 soaking treatments could reduce the activity of PPO. In conclusion, better effect on the storage of red grapes can be obtained with Na2S2O5 soaking treatment.

采用煤基直接还原-磁选工艺对某高铁锰矿进行铁-锰分离的试验研究。不配加添加剂时磁性产物铁品位为59.42%,锰品位为20.73%;非磁性产物锰品位为48.88%,铁品位为5.91%。为强化铁-锰分离,选择Na2CO3、Na2SO4和Na2S2O3作为添加剂进行还原试验,结果表明3种添加剂在还原过程中都能促进铁-锰分离,且Na2S2O3效果最优。在Na2S2O3用量为5%时,磁性产物的铁品位提高至85.38%,锰品位降低至9.08%;非磁性产物的锰品位提高至54.72%,铁品位降低至2.59%。研究了加入添加剂前后焙烧矿的微观结构和物相转变,结果表明Na2S2O3有利于Mn S和Mn2Si O4的形成并促进了铁晶粒的聚集长大。

Experimental study was conducted on the separation between iron and manganese in one high?iron manganese ore using coal?based direct reduction. Test without any additives resulted in the magnetic product grade of 59. 42% Fe and 20.72% Mn, while non?magnetic product grade of 48.88% Mn and 5.91% Fe. For the further separation between iron and manganese, Na2 CO3 , Na2 SO4 and Na2 S2 O3 were chosen as sodium additives in reduction. Results showed that three additives all facilitated the Fe?Mn separation, with Na2 S2 O3 bringing in an optimum effect. Adding 5% Na2 S2 O3 , resulted in the magnetic product with Fe grade increased to 85. 38% and Mn grade decreased to 9?08%, while non?magnetic product with Mn grade increased to 54.72% and Fe grade decreased to 2.59%. The microstructures and phase transformation of roasted ores were analyzed before and after adding Na2 S2 O3 , showing that Na2 S2 O3 is beneficial for the formation of MnS and Mn2 SiO4 , as well as the aggregation of iro

以多年生日光温室韭菜为试材，以10 mmol/L的硫为总量，研究了无机硫形态及配施对韭菜硝酸盐含量、氮代谢关键酶活性和营养品质的影响。结果表明：NaHSO3和Na2 S2 O3配合施用可明显提高硝酸还原酶（ NR）、谷氨酸草酰乙酸转氨酶（GOT）、谷氨酸丙酮酸转氨酶（GPT）活性，有效降低硝酸盐含量，其中以7．5 mmol/L NaHSO3＋1．25 mmol/L Na2 S2 O3（ S6处理）效果最为明显，降低了35．79％。施硫处理后，韭菜叶片可溶性蛋白质、游离氨基酸、可溶性糖、维生素C含量均有不同程度的增加，且以游离氨基酸增加幅度最大，2．5 mmol/L NaHSO3＋3．75 mmol/L Na2 S2 O3（S7处理）和5 mmol/L Na2S2O3（S4处理）分别提高了88．89％和83．33％，并且提高了游离氨基酸与可溶性蛋白比值A/P。同时，NaHSO3和Na2 S2 O3配合施用也表现出促进韭菜干物质的积累，增加韭菜株高和鲜质量。

With perennial greenhouse Chinese chive as experimental materials ,10 mmol/L sulfur as total,to study the effects of inorganic sulfur forms on the nitrate content of Chinese chive ,nitrogen metabolism and nutrition-al quality.Experimental results show that ,the combined application of NaHSO 3 and Na2 S2 O3 can significantly im-prove the activities of nitrate reductase ( NR) ,glutamic-oxaloacetic transaminase ( GOT) ,glutamic-pyruvic transam-inase ( GPT ) , and reduce the nitrate content effectively , especially , the effect of 7 .5 mmol/L NaHSO 3 +1 .25 mmol/L Na2S2O3 is the best,and it can decrease 35.79%.After sulfur treatment,and the content of soluble pro-tein,free amino acids,soluble sugar,Vitamin C in Chinese chive leaves increases in different degrees ,especially, free amino acids has the greatest increases .2.5 mmol/L NaHSO3 +3.75 mmol/L Na2 S2 O3 ( S7 ) increases 88.89%,and 5 mmol/L Na2 S2 O3 (S4) increases 83.33% and soluble protein (A1P) increase.Meanwhile,the combined appli

以海桑属(Sonneratia Linn. f.)红树植物无瓣海桑(S. apetala Buch.-Ham.)、海桑也S. caseolaris (Linn.) Engl.页、杯萼海桑(S. alba Smith)、卵叶海桑(S. ovata Backer)、拟海桑(S.× gulngai N. C. Duke et B. R. Jackes)和海南海桑(S.× hainanensis W. C. Ko et al.)为研究对象,比较了根际土壤和叶片中离子含量以及叶片光合和叶绿素荧光参数、叶绿素含量、抗氧化酶活性和 O-·2产生速率的差异,并分析了叶片中 Na+和 Cl-含量与部分生理生化指标的相关性。比较结果表明：海桑和拟海桑叶片中 K+含量最高、Na+和 Cl-含量均显著低于其他种类,但它们的根际土壤中Na+和 Cl-含量却较高。供试6种植物中仅海桑叶片对 Cl-的富集系数小于1,各供试种类对 K+、Na+、Cl-、Ca2+和Mg2+的富集系数均大于1；无瓣海桑对离子的富集系数由大至小依次为 Mg2+、K+、Ca2+、Na+、Cl-,其他种类对离子的富集系数由大至小均依次为 K+、Ca2+、Mg2+、Na+、Cl-。无瓣海桑和海桑的 chla、chlb 和总叶绿素含量差异不显著,但均高于其他种类；供试种类的 chla/ chlb 比值均约为3,可能与海桑属植物为阳生植物有关。无瓣海桑的 Pn、Tr 和Gs 均最高,而杯萼海桑的 Pn、Tr 和 Gs 均最低,但6种植物的 Ci 无

Taking mangrove plants of Sonneratia apetala Buch. -Ham., S. caseolaris (Linn.) Engl., S.alba Smith, S. ovata Backer, S. í gulngai N. C. Duke et B. R. Jackes and S. í hainanensis W. C. Ko et al. in Sonneratia Linn. f. as investigation objects, differences in ion content in rhizosphere soil and leaf and differences in photosynthetic and chlorophyll fluorescence parameters, chlorophyll content, antioxidant enzyme activity and O · 2 production rate in leaf were compared, and correlations of Na+ and Cl--contents in leaf with some physiological and biochemical indexes were analyzed. The comparison results show that K+ content in leaf of S. caseolaris and S. í gulngai is the highest and Na+ and Cl- contents in their leaf are significantly lower than those of other species, but Na+ and Cl- contents in their rhizosphere soil are higher. In these six species, enrichment coefficient of leaf to Cl- is lower than 1 only in S. caseolaris, while that of leaf to K+, Na+, Cl-, Ca2+ and M

基于2-巯基乙醇-硫代硫酸钠-纳米金/Pb2＋（2-ME-Na2 S2 O3-AuNPs/Pb2＋）体系的纳米金浸出反应，开发了一种低成本、可通过肉眼灵敏检测Pb2＋的纳米复合薄膜。优选出聚酰胺-6（ PA-6）层析薄膜，通过吸附牛血清白蛋白（ BSA）修饰的纳米金（ AuNPs），制备得到一种色泽均匀的BSA-AuNPs/PA-6纳米复合薄膜。考察了 PA-6薄膜吸附 BSA - AuNPs 的时间，2-ME - Na2 S2 O3- AuNPs/Pb2＋反应体系中2-ME 和Na2 S2 O3的浓度，以及反应温度和反应时间对Pb2＋检测的影响。结果表明，在优化条件下，吸附30 min后，0.05 mol/L的Na2 S2 O3及0.25 mol/L的2-ME在80℃下反应20 min，即可通过肉眼实现对Pb2＋的检测，灵敏度可达2.0×10-8 mol/L；同时，该方法具有高选择性。将BSA-AuNPs/ PA-6纳米复合薄膜应用于自来水中Pb2＋的检测，通过肉眼判断，检出限可达到5.0×10-8 mol/L。

A simple and low-cost composite film was prepared,based on which a sensitive detection method of lead ions(Pb2+)in aqueous solutions with naked eye was developed. Polyamide-6(PA-6) thin layer chromatographic membrane was selected to adsorb bovine serum albumin( BSA)modified gold nanoparticle( AuNPs),and a stable BSA-AuNPs/PA-6 nanocomposite film with a uniform red color was prepared. The adsorption time of BSA - AuNPs to PA-6 membrane, concentrations of Na2 S2 O3 and 2-ME as well as reaction temperature and time in the 2-ME-Na2 S2 O3 -AuNPs/Pb2+leaching system were investigated,which demonstrated obvious effects on the detection of Pb2+. Un-der the optimal conditions( BSA - AuNPs and PA-6 incubate together for 30 min,0. 05 mol/L Na2 S2 O3 ,0. 25 mol/L 2-ME,nanocomposite film and leaching agents incubate together at 80 ℃ for 20 min),the BSA-AuNPs/PA-6 nanocomposite film allowed for the sensitive detection of Pb2+ with naked eye with a sensitivity as low as 2. 0 × 10 -8 mol/L