硫酸

Potassium ferrocyanide itself is only slightly toxic,[3] although adding acid to its aqueous solution releases toxic hydrogen cyanide gas.

比如硫酸，硝酸，盐酸——这个在人胃里是消化液，醋酸）释放出有毒的氢氰酸。

For the system of industrial test for treatling 200m 3/d wastewater, the removal rate of COD reached to over 90%, and the H 2S in firedamp was finally recovered as the by-product of sulfur.

这些物质在厌氧环境下，通过硫酸还原菌的作用，产生大量硫的还原产物存在于消化液中，一方面引起设备的腐蚀，使水质产生异味；当这些物质在消化器中积累到一定浓度，就对甲烷菌产生严重的抑制作用。

The optimum process conditions of treating chromium-contained wastewater with low concentration and the optimum reflux rate of settled bottom stream of flocculate are obtained.

以长沙铬盐厂的含铬废水为试验水样，研究了用七水硫酸铁、亚硫酸氢钠、铁屑 3种还原剂达标处理较低浓度含铬废水的适宜工艺条件和悬浮液絮凝体沉降底流的最佳回流率。

Flocculation performance of our product on turbidity, chrome and chemical oxygen demand have been carried out.

混凝实验表明聚合硫酸铁具有较好的去浊、除Cr和COD的能力。

In addition, the analytical results of the flocculent mechanism and coagulating dynamics of PFS have showed that the distribution conformation and stability of PFS, the mixed intensity and time are the key factors of the coagulating effect.

催化剂和助催化剂投加方式等工艺条件进行的分析确定了聚合硫酸铁合成反应中的最佳工艺参数。

In the wet-process phosphoric acid production from the Hubei phosphate ore, one of the bothersome problems is that potassium fluosilicate and sodium fluosilicate scales are liable to form on the filtration system owing to its high potassium and sodium content, which greatly restrains the application of Hubei phosphate ore.

本文首先采用人工冷却系统模拟湿法磷酸生产的真空过滤系统冷却过程，研究垢物的析出规律，实验结果得知：垢物的主要成分为氟硅酸钠和氟硅酸钾，氟硅酸钠首先析出，结构致密，其次是氟硅酸钾，最后是二水硫酸钙，氟硅酸钠对氟硅酸钾有很强的结晶诱导作用；然后在三种生产中常用的不同的材质钼二钛、聚氯乙烯和聚四氟乙烯表面进行结垢试验，发现聚四氟乙烯表面最不易结垢，而在钼二钛表面最易结垢。

Monoammonium phosphate,diammonium phosphate,compound fertilizer,superphosphate,sulfuric acid,ammonium sulfate,sodium sulfate,sodium fluosilicate and so on.

磷酸一铵，磷酸二铵，复混肥料，过磷酸钙，硫酸，硫酸铵，硫酸钠，氟硅酸钠等。

The organisms in the mine drainage, which lie in a pink slick on pools of acidic green water, obtain energy by oxidizing iron - that is, generating rust -- and in the process create sulfuric acid and dissole pyrite (iron sulfide or fool's gold) to release more iron and sulfur.

在铁矿排水的地方，这些微生物靠氧化铁离子来获得能量，在这过程中产生更多的硫酸融解黄铁矿，于是产生更多的离子和硫化物，造成水源污染，作者试验的地点中微生物造成了很大污染。

METHODS: With formamide as dispersing agent, agarose was sulfated with the method of chlorosulfonic acid-pyridine.

以琼脂糖为原料，甲酰胺为分散剂，通过氯磺酸吡啶法制备了硫酸酯化琼脂糖。

TH-904 is used as chelant in papermaking coating, building coating, concrete retarder, water reducer, woven and dyeing. Its performance can reach to that of SN-5040. Adding TH-904 to slurry during grinding process of bolus alba, lime carbonate, pottery clay, titanium pigment, French chalk, barium sulfate, coal-water slurry, etc., the viscosity can be largely reduced and the dispersed slurry is stable.

TH-904水性分散剂广泛用做造纸涂料及建筑涂料的分散剂、混凝土缓凝剂、减水剂以及纺织印染等行业作螯合分散剂，性能达到SN-5040水平，在高岭土、碳酸钙、陶土、钛白粉、滑石粉、硫酸钡、水煤浆及水泥等浆料的研磨加工过程中加入TH-904分散剂能极大地降低被加工物料的粘度，便于物料的加工，且分散后浆料粘度稳定。

In the negative and interrogative forms, of course, this is identical to the non-emphatic forms.

。但是，在否定句或疑问句里，这种带有"do"的方法表达的效果却没有什么强调的意思。

Go down on one's knees;kneel down

屈膝跪下。。。下跪祈祷