查询词典 acid-carbonate

The results indicated that the leaching of acid rain led to increasing of latent acid of soil in short time though amortizing of soil to acid precipitation.

许多研究认为，人为酸化的因素主要有大气污染引起的酸雨输入 [2、3] 和施入氮肥引起的硝化作用 [4、5] 两方面。

Experimental results indicated that performic acid and hydroxyl radical produced in 30% H2O2-HCOOH-Fe(superscript 2+) were combined to oxidize model organic sulfide with desulfurization ratio of over 96%. Catalytic performance of the combination of Fe(superscript 2+) and formic acid was higher than thin of only formic acid.

实验结果表明：30%H2O2-HCOOH-Fe(上标 2+)产生的过氧甲酸和羟基自由基能迅速将模型有机硫化合物氧化，氧化脱硫率可达到96%以上，Fe(上标 2+)和甲酸的催化氧化性能明显优于单纯使用甲酸。

First, the speed of the reaction between mud acid and rock is very fast, the effective distance of acid is short, active acid can not reach deep formation.

首先，高温下常规土酸与地层矿物反应速度极快，酸液有效作用距离短，活性酸不能到达地层深部；其次，HF与铝硅酸盐的化学反应不是简单的一次反应，其副产物氟硅酸和氟铝化物还可与铝硅酸盐发生二次反应和三次反应，形成一系列不溶性的沉淀物，对储层造成严重伤害；第三，高温情况下酸液对井下管柱及工具腐蚀性很强，对缓蚀剂性能要求高。

Because acid rain can transport excessive hydrogen ion into the soil, then cause decrease of pH value and cation saturation, accelerate acidify of soil, therefore, it is significant to study the ecological effects of combined pollution for heavy metals under intimidation of acid rain in the regions where acid rain often take place.

土壤吸附-解吸试验的土壤按照既定方案处理后，在25±1℃，土壤水分20％左右条件下培养2个月，待重金属元素与土壤的反应基本稳定后制样进行等温吸附—解吸试验，研究紫色土在单一及复合条件下镉、锌的吸附特征和酸雨胁迫下的解吸特征以及此条件下吸附一解吸与镉、锌生物有效性的关系。

Low molecular weight mannuronic acid, guluronic acid and κ-carrageenan were prepared from algin and carrageenan by the acid hydrolysis method, and their weight average molecular weights and the distribution widths of molecular weight were determined by high performance gel permeation chromatography respectively.

本文以褐藻胶和κ-卡拉胶为原料通过酸水解分别获得了低聚的甘露糖醛酸，古罗糖醛酸和低聚κ-卡拉胶，并采用HPGPC法测定了这3种低聚糖的重均分子量。

Low molecular weight mannuronic acid, guluronic acid and κ carrageenan were prepared from algin and carrageenan by the acid hydrolysis method, and their weight average molecular weights and the distribution widths of molecular weight were determined by high performance gel permeation chromatography respectively.

本文以褐藻胶和κ-卡拉胶为原料通过酸水解分别获得了低聚的甘露糖醛酸、古罗糖醛酸和低聚κ-卡拉胶，并采用 HPGPC法测定了这 3种低聚糖的重均分子量。在此基础上再经硫酸酯化和成盐修饰制备了各自的硫酸酯碱式铝盐。

Method］ First of all,esters and lactone reacted with hydroxylamine and formed hydroxamic acid under alkaline conditions; secondly,hydroxamic acid reacted with Fe3+ and generated amaranthine hydroxamic acid-iron complex; finally,esters and lactone contents were measured indirectly at the wavelength of 506 nm.

方法］首先，酯和内酯在碱性条件下与羟胺反应生成异羟肟酸；然后，在酸性条件下异羟肟酸又与Fe3+络合生成紫红色的异羟肟酸铁络合物；最后，在506 nm波长下间接测定酯和内酯含量。

Nitrile is a kind of organic compounds containing cyano group,it is a starting material to synthesize a series of amine,acid and polymer.Hydrolysis reactions of nitriles have been widely applied in plentiful of organic synthesis such as amino acid, amide,carboxylic acid and its derivatives,which occupy an extremely important position in organic synthesis.

腈是一类含氰基的有机化合物，作为合成一系列胺、酸和聚合物的起始原料，其水解反应广泛应用于氨基酸、酰胺、羧酸及其衍生物的合成，在有机合成中占有极其重要的地位。

The change of remaining litter weight was the largest in the earlier 30 days during 60-day litter decomposition, and there was no significant difference in subsequent 30 days. The phenolic acid content of litter was significantly reduced with the decomposition time prolonging, and the releasing quantity of phenolic acid was the highest at the tenth day. The amounts of soil Aerobic azotobacter, Ammonifier and Aerobic cellulose-decomposer and the soil chemical properties such as pH, phenolic acid content, NH+4-N and available phosphorus were significantly affected by the litter aqueous extract of four decomposition stages.

凋落物分解的60d中，凋落物残留量在前30d内变化最大，30d后无显著变化；凋落物中酚酸含量随分解时间的延长，呈显著降低的趋势，且在分解10d时，酚酸释放量最大。4个分解动态的凋落物浸提液显著地改变了土壤好气性自生固氮菌、氨化细菌、好气性纤维素分解菌的数量和土壤pH值、酚酸含量、铵态氮、有效磷等化学性质。

The phenolic acid content of litter was significantly reduced with the decomposition time prolonging, and the releasing quantity of phenolic acid was the highest at the tenth day. The amounts of soil Aerobic azotobacter, Ammonifier and Aerobic cellulose-decomposer and the soil chemical properties such as pH, phenolic acid content, NH+4-N and available phosphorus were significantly affected by the litter aqueous extract of four decomposition stages.

凋落物分解的60 d中，凋落物残留量在前30 d内变化最大，30 d后无显著变化；凋落物中酚酸含量随分解时间的延长，呈显著降低的趋势，且在分解10 d时，酚酸释放量最大。4个分解动态的凋落物浸提液显著地改变了土壤好气性自生固氮菌、氨化细菌、好气性纤维素分解菌的数量和土壤pH值、酚酸含量、铵态氮、有效磷等化学性质。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。