who can help me translate the follow sentences, please. The limit test for sulfates is provided to demonstrate that the content of sulfates does not exceed the limit given in the individual monograph in terms of micrograms of sulfates per gram of the substance being tested.The solution against which the comparison of turbidity is made contains 480 μg of SO4- - more than the standard barium sulfate suspension. Is it means that:砷的限量试验是在，砷的含量不超过规定文献中的限度(单位为：微克砷/每克物质)的条件下测定的.此方案针对浊度进行了比较，发现含有480μg的SO4多于硫酸钡悬浮液的标准.