| 1. | The na2edta volumetric method for the determination of lead content
容量法测定铅量 |
| 2. | Copper alloys . determination of iron content . na2edta titrimetric method
铜合金.铁含量的测定.二乙二胺四乙酸钠滴定法 |
| 3. | Effects of na2edta and na4edta ' s concentration on dissolving caso4 were studied
研究了反应浓度对na _ 4edta和na _ 2edta溶解硫酸钙的影响。 |
| 4. | Methods for chemical analysis of lead concentrates - the na2 edta volumetric method for the determination of lead content
铅精矿化学分析方法na2edta容量法测定铅量 |
| 5. | Methods for chemical analysis of lead concentrates - the na2 edta volumetric method for the determination of zinc content
铅精矿化学分析方法na2edta容量法测定锌量 |
| 6. | For na4edta , and the effect of ionic strength on the chelating properties of na4edta and na2edta for caso4 was reviewed
考察了含盐量对na _ 4edta和na _ 2edta溶解硫酸钙性能的影响。 |
| 7. | Methods for chemical analysis of zinc oxide produced by direct process - determination of zinc oxide content - na2edta titration method
直接法氧化锌化学分析方法na2edta滴定法测定氧化锌量 |
| 8. | In the process of na2edta cleaning the fouled membrane , concentration and time had high remarkable effects , ph and pressure had remarkable effects but temperature had not obvious effect
在nazedta对污染膜的清洗过程中，浓度，时间对清洗效果影响是高度显著的， ph和压力对清洗效果影响显著，而温度则无明显影响。 |
| 9. | At last , on the basis of above experiments , the five - factor - three - level orthogonal experiments on the relative flux recovery ratio after na2edta and na4edta cleaning pvdf microfiltration membrane that was fouled by caso4 were done
最后，在前面实验的基础上，作出na _ 4edta和na _ 2edta对硫酸钙垢污染的pvdf微滤膜清洗后，相对通量恢复率的五因素三水平正交实验。 |
| 10. | The high - efficiency cleaning agent and optimum conditions were chosen and it has some guiding significance on practice . the main tasks include : by the contrastive experiments of sodium tripolyhosphate , sodium hexametaphosphate , na2edta and na4edta dissolving caso4 , na2edta and n ^ edta were chosen as cleaning agents in this experiment
主要包括：通过对三聚磷酸钠、六偏磷酸钠、乙二胺四乙酸二钠、乙二胺四乙酸四钠四种螯合剂对硫酸钙溶解性对比实验，最终选择乙二胺四乙酸二钠和乙二酸四乙酸四钠作为本实验清洗剂。 |
