主题：能否帮忙翻译一下？

那位高手帮忙翻译一下METHOD 3060A中的一个片断，本人在理解时存在一点障碍，谢谢！
8.5 Both soluble and insoluble pre-digestion matrix spikes must be analyzed at a
frequency of one each per batch of < 20 field samples. The soluble matrix spike sample is spiked
with 1.0 mL of the spiking solution prepared in Section 5.8.1 (equivalent to 40 mg Cr(VI)/Kg)) or at
twice the sample concentration, whichever is greater. The insoluble matrix spike is prepared by
adding 10-20 mg of PbCrO (Section 5.6) to a separate sample aliquot. It is used to evaluate the 4
dissolution during the digestion process. Both matrix spikes are then carried through the digestion
process described in Section 7.0. More frequent matrix spikes must be analyzed if the soil
characteristics within the analytical batch appear to have significant variability based on visual
observation. An acceptance range for matrix spike recoveries is 75-125%. If the matrix spike
recoveries are not within these recovery limits, the entire batch must be
rehomogenized/redigested/reanalyzed. If upon reanalysis, the matrix spike is not within the recovery
limits, but the LCS is within criteria specified in Section 8.3, information such as that specified on
Figures 1 and 2 and in Section 3.1 should be carefully evaluated . The Cr(VI) data may be valid for
use despite the perceived "QC failure." The information shown on Figure 1 and discussed below
is provided to interpret ancillary parameter data in conjunction with data on spike recoveries.